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Showing posts with label orchid culture. Show all posts
Showing posts with label orchid culture. Show all posts

Saturday, July 28, 2012

In Bloom: Summer Miniature



Dyakia hendersoniana, formerly known as Ascocentrum hendersonianum, is a very adorable miniature species.  These bloom on an inflorescence up to 6 inches high covered with wee, purple-pink flowers with a white lip in late Spring or early Summer. They can be grown along side Phalaenopsis, pretty much the same conditions but with maybe a little bit more light.  I am keeping mine in slightly stronger light than the phals right now, but they spend the Winter in a slighty shadier spot.  Great plant for those of you looking to branch out, and great plant for the miniature collectors out there too!  Now available in the shop!  :)

Sunday, June 24, 2012

In Bloom: Moth Diner

Following much personal change and a good deal of procrastination and total distraction with mad knitting, I've decided its time to start posting to the Plant Geek Chronicles again (and, uh, paying more attention to the plants...yep, had some survival of the fittest experimentation).

I'm starting easy, by showing you some goodies in bloom. First, we've got a lovely variegated Neofinetia falcata, tagged as 'Higashidemiyako'.



I'm very pleased with it. It might not be an extremely rare form, but I still think its awesome. Neofinetia falcata is a Japanese species, and all the most interesting plants are still Japanese in origin or recent ancestry. These plants are also easier to grow. I've had trouble with the ones that have been bred in the US for several generations. Likely those are all horribly inbred. But so far I have four that I believe to be of Japanese origin, and not only are they of more interesting varieties, they're so adaptable and easy to grow!

They're also sweetly fragrant, somewhat reminiscent of honeysuckle. As the flower form includes a long spur and the plant displays increased fragrance at dusk and dark, I suspct the plant is probably moth pollinated in its natural habitat. I don't know this for sure, if you have any data on this please chime in.

The other goodie I have to share is a Brassavola acaulis, which I am sure is moth pollinated.



This plant is also cool, and surprisingly sturdy. The 'leaves' are long, pendant...well...green sticks in appearance. Almost based on the appearance and the placement in genus Brassavola you'd assume *Super High Light!* But nay. On the advice of the ever knowledgeable Al, I've kept it with the large mounted phalaenopsis plants, so low-medium light (by orchid standards, mind you ::shakes finger::), and decent watering. Though, to be fair, through the winter I tend to not water enough. The phals were a little crabby about that but they're still alive. Some sources suggest 3-4 hrs light for this species, but mine lives in an East window just fine. It is possible it will adapt to either situation. In any case, it bloomed.

Here again, like most moth pollinated species, it isn't very impressive in the day. As soon as it gets dark, though, you can smell it from across the room. It has a vaguely citrus-y rose-y scent. Very pleasant.

Friday, September 30, 2011

An introduction to Orchids as Houseplants

Frequently I hear ‘orchids are just too sensitive’ or ‘I could never…’, but honestly orchids are not always as difficult as people think. With the number of orchid species estimated at as much as 30,000 species (not a typo, see also Kew: Science and Horticulture: Orchidaceae) and native species found on every continent and climate except Antarctica, plus countless man-made hybrids, finding something right for your house is just about knowing what to look for in an orchid plant. Keeping it alive is just about being well informed (and occasional watering).

How is an orchid different? While there are many answers to this question, what really matters to the home grower is that many orchids, and certainly most of the common types grown as houseplants, are epiphytes. This is a situation where the plants use a tree branch (or occasionally rock crevice) as a condominium. They are not parasitic, just opportunistic. What this means to you as the home grower is that orchid roots are accustomed to an environment where while there might be frequent rain, there is also strong air movement. Many types can even be grown on a wood plaque with no media around the roots (see article here). Similarly, if your nicely potted plant has a root sticking out of the pot somewhere you shouldn’t be alarmed – in orchids this is not necessarily cause to repot. Some orchids just don’t really understand the concept of a pot and so throw their roots in every direction.

Good watering methods are key to root health. Watering of some houseplants is accomplished by leaving them to sit in water for hours at a time. This is not recommended with orchids (with a couple exceptions of some Phragmipedium species that live on river side rocks) as it may lead to root rot. The easiest thing to do is water the orchid by running plenty of water through the pot from the top. Once the media is well wetted, let it drain, then return it to the window.

For best results, orchids are potted in a fluffy or chunky mix that gives a nice balance of holding moisture but allowing air circulation. To maintain root health, repotting your orchids into fresh potting media every one to three years is recommended. Here is a repotting article.

Ok, so all that is great, but how to pick an orchid??

The most important piece of advice is to purchase a plant that is well established. You certainly can have success also with that $5 seedling in a two inch pot, but you will likely find it easier with more immediate gratification to buy a plant that is at least within 1-2 years of blooming for the first time. When buying a plant in person, especially at a place like the grocery store, challenge the plant by gently grabbing the leaves and lifting or moving the plant back and forth to see how well it is rooted into that pot. Good roots mean a healthy plant and more likely success.

Second is to look for a plant that matches your light conditions. For up to a few weeks at a time during blooming you can stick an orchid where it won’t get much light (say, the kitchen table) to enjoy it, but the rest of the year you will want to find a window for it to live in. Here’s a handy guide for commonly available orchid types, based on an unobstructed window, plant sitting right on the windowsill:

North facing window: Rather weak light. You might be able to grow a Paphiopedilum (Paph) there, or some Phalaenopsis (Phal). If it doesn’t bloom for you, supplement with fluorescent light.

East facing window: Great spot for Paphiopedilums and Phalaenopsis.

West facing window: Also great spot for Paphiopedilums and Phalaenopsis. Frequently this is also enough light for some Dendrobium (Den or Dend) plants or certain miniature Cattleya (Slc. or Pot.) hybrids, as well as several Oncidium types.

South facing window: This is your brightest light, excellent for Cattleya hybrids (Slc., Lc., C., Blc., Pot., Sl., Lc….), many Dendrobiums, and Oncidium intergeneric hybrids.

If you aren’t sure what category your plant-of-interest falls into, ask the grower for more details. They want you to succeed too!

I always recommend if you aren’t sure, go with a Phalaenopsis (Phal.) or Paphiopedilum (Paph.). These types are easy to grow, adaptable, and you can always make a very bright window less so by setting the plant back from the glass a little or using a sheer curtain to filter the light. Other culture details are fairly similar for the two types. You can find an article on growing phals here.

Tuesday, July 7, 2009

Market Day this Sunday!

July 12 is our next market day! Come out and hang with the plants from 10AM to 1PM at the Clarksburg Farmer's Market! While you're there, you can get some veggies, coffee, crepes, and maybe some crab cakes, crafts, and BBQ!!! How awesome is that?

In addition to some interesting plants, I'm planning on also bringing some potting mixes and will bring a couple plants for potting demonstrations.

Hope to see you there!

Friday, July 3, 2009

A variety plaque

Like container plantings with all their variety? Interested in plants other than orchids? Interested in something sure to be a conversation starter in your living room window? Why not setup a little community plaque with a variety of interesting little plants?

This is an example I just started recently, so the plants are not established yet. We have a bromeliad (Cryptanthus bahianus), a Dischidia ovata cutting, and the runts of the litter for both Phalaenopsis (lindenii x pulcherrima) and Dendrobium Maiden Charlotte (all other plants I have of those are more mature). The trick is matching up a variety of plants with similar requirements for light, water, and temperature. I've also selected for this plaque four plants that will stay relatively compact and not overwhelm each other, although that dischidia could one day have many vines, but they're easy to pull off things and send off in another direction.

I'd really like to make another community with a Dend. tetragonum, but can't decide what would work well with it. Dend. tetragonum is a semi pendant species. I wouldn't want it to get visually lost among its companions. Perhaps something squat like Sophronitis cernua would work, but their water requirements are a little different. They might adjust though. I'll have to think on it.

If you make one, please send me a photo!!

Sunday, June 28, 2009

Diagnosis: Root Rot

Recently someone came to me with a problem. Their orchid lost its buds soon after purchase, and hasn't bloomed or really done anything since. Since there are many many reasons for bud drop, we started discussing what might be happening. Fortunately, the owner sent me this photo of her plant. Immediately I could tell the plant has root rot, which is ultimately the cause for its listlessness.

Photo provided by Tatyana.

Root rot is one of the most common diseases with orchids. Pretty much everyone has had to deal with it at some point or another. The most sad part is that new orchid growers, who are often not even at fault, mistakenly believe they "can't grow orchids" because they have simply purchased a hardware store plant that already has root rot without knowing. Today I am going to teach you how to diagnose, treat, and prevent root rot.

SYMPTOMS:

* Floppy, listless leaves. Although phalaenopsis leaves can be healthy and still bend or flop over in order to take the most advantage of the light, they should still be pretty tough and thick. These leaves, if touched, would feel withered and soft. Notice also the wrinkles on the leaf top-most in the photo. This plant has not been able to absorb enough water into its little body.

* Exposed roots, while healthy, are also withered and possibly brittle. Exposed roots are normal with phalaenopsis plants. However, they should be plump and active. (its OK to have some that are shutting down, since getting rid of old parts is normal for plants). This plant has been sacrificing water and sugars in the roots and other parts of the plant to live.

* Many to all in the media will be black and squishy - dead and rotting. This is the defining characteristic of the disease.

OTHER INDICATORS AND RISK FACTORS:

* Media appears to be a normal potting soil, which with a few exceptions is not really an appropriate potting mix for orchids. Exceptions include true terrestrial orchids (e.g. "jewel" orchids like Ludisia discolor), and people with experience using a media like this. There are some top growers who use a chunky coarse peat-based mix with great success, but for most people it stays too wet. It also requires regular repotting, since as it breaks down it will hold even more water. Staying wet too long leads to root rot, just like walking around with your feet wet might lead to foot fungus. Note also that this type of media has been popular with large nurseries growing plants for the "pot plant" trade, where plants are expected to be purchased just for the flowers and then tossed.

* In some cases, media may also just be a very degraded typical orchid mix. As noted above, rotting media starts to hold more and more water, increasing the risk for root rot if adjustments in the watering regeme are not made or the plant is not repotted.

TRIAGE AND TREATMENT:

* Pull the plant out of the pot immediately, removing all old media and dead roots. Dead roots will be squishy or papery and black. Leave any firm, healthy roots. Hose off plant.

* Cut or break away the base of the stem if it appears to be infected. Dust cut surfaces with cinnamon or sulfur.

* Optional: Spray plant with fungicide. > I generally do not do this for root rot as fixing potting problems are generally all that is needed to stop the spread of the problem.

* Leave to dry overnight.

* Optional: Soak entire plant in a warm solution containing a low concentration of sugar, a few drops of Superthrive (B vitimin / NAA coctail), and a low concentration of chemical fertilizer. > I have only tried this approach a few times. I cannot say if this actually confers an increase in survival rate, but am providing it for completeness.

* Repot plant into appropriate media. For rehabilitation of difficult cases I suggest using sphagnum moss, which has mild antibacterial properties. Prewet it and pack only loosely around the roots. Wetting any existing thoroughly will help them be more flexible. In this case, the only remaining roots were the surface roots. These were placed in the media so that they can better serve the plant during its recovery.

PROGNOSIS:

Plants with root rot can survive. Minor cases generally always survive. A case such as this will, not surprisingly, have a lower survival rate. Expect the more severe cases to take a year or more to recover fully.

PREVENTION:

* Repot your plants regularly to keep the media fresh. This will be approximately every 1-3 years depending on plant type, media type, and your watering habits. Repotting means removing old media and replacing with new. It does not always mean moving up in pot size. In some cases it can even mean a reduction in pot size.

* Know what is an appropriate watering regimen for your plant. This will depend on what type it is. If it is something unfamiliar to you, ask the grower you're getting it from. Also, hang on to your plant labels in case you have more questions down the road. Being able to tell other growers exactly what you have will make it easier for them to help you. Note that watering amount is not the issue. Watering frequency is. When it is time to water, water heavily and let it drain well. Letting a plant sit in water is generally not a good idea.

* If you buy from a non-orchid grower (such as from a perennial specialist) or hardware store, repot it immediately or as soon as possible. If it comes in "dirt", repot immediately even if the plant is in bloom. At the very least it is a good idea to pull a plant out of the pot and look at the roots and condition of the media when you get home with any plant.

DIFFERENTIAL:

* Watering too little can give the plant the same appearance. Definitive diagnosis here lies in the condition of the roots. Watering too little will of course not cause rot.

* High salt buildup can also cause a similar appearance, again minus the root rot. This essentially would be a dessication case. Salt buildup rarely reaches critical levels, however. You can identify it by a peculiar appearance of the media, including crusty deposits. This can generally be fixed by repotting, then prevented by watering occasionally with rainwater or RO water if fertilizer (or by fertilizing less!), or occasionally with Epsom salts (Magnesium Sulfate) solution if the cause is hard water.

ADDITIONAL INFORMATION:
Other helpful articles on this blog you may find helpful-
Basic Phalaenopsis Culture
Reasons for Plant Collapse in Phalaenopsis
How to repot a Paph Orchid

Wednesday, May 27, 2009

Dendrobium species culture

Hi folks, just ran across this page giving an overview of Dendrobium species culture based on group, and wanted to share. There are a lot of cool Dendrob's out there, but they can vary greatly. This might give you a good starting point, from which you can research more individual species and groups. The one thing it says that I'm not sure I agree with is "medium to high light" for Latoria species. Even here on the East coast I've seen latoria hybrids burn in higher light. I keep them in phalaenopsis level light with no problems. Latorias are great by the way! :) The photo above is one I currently have available in my shop. (There will be more soon if they don't all sell at market!)

Saturday, March 28, 2009

How To: Detach Sticky Roots

Phal. schilleriana 'Pink Butterfly'Once in a while you come across an orchid that seems to be able to attach itself to anything, especially things you'd rather it didn't. Some actually have a special talent for this. Phalaenopsis schilleriana and philippinensis are two excellent examples. Recently I wanted to photograph a Phal. schilleriana (left) from a tray containing a few plants of each of the mentioned species plus a few other plants. To do this, I had to extract it first.

Most of the plants came out easily, leaving me with a firmly attached handful of plants. The three you see in the image were the worst. Now obviously you can just grab and pull at this stage, but that results in several torn roots. While there are times when there isn't much choice, I like to avoid that if I can, especially on youngsters like the two on the left. So what to do? Well, the first step is to wet the roots. Wet roots are more pliable, less brittle, making it easier for you to manipulate them. (This is also a great trick when repotting!)










Next, simply use your thumbnail or other smooth, flat object to pry the roots loose. Starting at an already loose spot (usually at the end closest to the plant), push your thumb under the root and gently wiggle forward under and along the root.

Pretty soon, you might actually be able to lift your plants! Here are all those roots, now hanging free but still intact.

Root characteristics vary somewhat among phals. These two species have a very particular root type that is flattened with an extra pebbly texture. They can stick to anything, and will do so at every opportunity. Incidentally, this detail make both species, as well as other species and hybrids with similar morphology, excellent candidates for mounted culture as they tend to establish very quickly.

Thursday, March 19, 2009

Update: Germinating orchid seeds

More spectacular microscope adventures, starring a gazillion orchid seeds!

germinating orchid seeds, protocormsThis series of photos was actually taken last Sunday, placing the time line at 4 weeks post sowing. This first one shows the Laelia tenebrosa 'Coast Ovelins' AM/AOS x self, first shown in this post. You'll see some are much further along, some are starting to swell, and some are just sitting there thinking about it. The forming protocorms (green) have now shed their seed coats. This you can still see on the top right green mass - there is the empty husk along its bottom right side. Magnification is about 38x in this photo.

germinating orchid seeds, protocormsgerminating orchid seeds, protocormsgerminating orchid seeds, protocormsThis one is Encyclia mariae, OSP #2769, magnification ~29x in the top photo, 144x in the bottom two photos, which were taken with blue light and a red-green filter. Here again you see a variety of developmental stages. The higher magnification photos also gives you a better look at the cast off seed coats, to the top right of each large protocorm. (Remember that chlorophyll naturally auto-fluoresces red under blue light, that is why they appear red in these photos) Possibly the most interesting thing about these two photos, however, is that on the bottom of the center protocorm you can see the beginnings of two nearly transparent root-like structures. I do not believe they are actual roots, but a simpler, more primitive structure. As protocorms develop, they form their first leaf and several fuzzy hairs on the other side. I suspect these are most similar to root hairs in structure, probably formed by one to a few cells each with no differentiation in terms of cell function, for the express purpose of improving water absorption over short distances. A true root has many cell types, each with its own function, shape, and location. Can anyone confirm for me the nature of the little hairs in the photo?

I also have plates of Cattleya leopoldii v. alba, OSP# 1383 which were sterilized and plated at the same time. Unfortunately these show no definite germination at this time, only an obvious difference between viable and not viable seeds. Not all seeds will germinate as quickly as the ones shown above. Hopefully these will start to germinate soon, too.

Tuesday, March 10, 2009

In Bloom: Bulbophyllum ambrosia

Bulbophyllum ambrosiaThe miniature species Bulbophyllum ambrosia is reported to be sweet smelling, some say 'like honey', but I must admit I found it more 'smelly' than 'sweet'. But it was at least fragrant.

This poor little plant gets a fair amount of abuse from me. Its a species that wants copious amounts of water and I just don't water it enough for it to be really happy (trying to change that, honest), but it muddles along and occasionally blooms for me. What a dutiful little plant. I divided it into several pieces after this blooming so hopefully will have some to share in a few months.
Many bulbophyllums and cirrhopetalums are moisture loving. At the same time, most of them like lower light conditions, like phalaenopsis light, so are easy to accommodate in many homes. If you like to water a lot, you might consider trying one of these species.

Monday, March 9, 2009

Portrait of a Plant Stand

This is a new plant stand I recently completed. It will considerably shorten my daily watering routine by allowing me to water many of the mounted plants with a watering can rather than taking them in batches to a sink.
It consists of hard wire cloth affixed to a simple pine frame with a plywood base. There is plastic sheeting in the back, simply attached so that it will be easily replaced if it develops an algae coating. There is a plastic bin on the bottom to catch drip and to house a few phrags and some ferns. Also, there are wheels on the bottom to easily allow me to move the stand around as needed for watering.

Wednesday, March 4, 2009

Temperature Sensitive Pigments

Dend. Himezakura x Super IseThis is a first bloom seedling of Dend. Himezakura x Super Ise, a relatively compact and warmth tolerant Nobile Dendrobium hybrid. I have a batch of them and this is the first to bloom. I'm pleased with it, it is quite cute. Also, it is quite well flowered with 5 short inflorescences each carrying 2-3 flowers about 2 inches across.

The most interesting thing about it though, is that it seems to have temperature sensitve pigment production. I brought it up from our unheated basement (~55F this time of year) to a cool window in the living room (room ~67, window probably a bit less, especially at night). At the time, it had a few open flowers, several buds that opened soon after, and two buds at the top that needed to develop a bit before opening. All of the first flowers to open are white with a pink blush toward the edge. The last two younger buds are the ones you see above with the strong pink edges on the petals. The anther cap is also pink in these flowers. This must be a response to the warmer temperatures during the critical stages of bud development for these two. I think next year I'll bring it upstairs earlier, or just keep it up here permanently, so that all the flowers will be this vibrant!

Growing info for these plants:
These are dwarf nobile type, reaching perhaps a height of ~18 inches (currently ~10 inches tall in 2.5 inch pots). Nobile group plants are deciduous, meaning they generally shed their leaves every year. Don't worry when the leaves start looking a little blah in winter than fall off as long as the canes look good.

Grow like a phalaenopsis in Summer, but increase light and decrease temperature somewhat in Winter. If they don't flower for you they're not cool enough at night. I keep my plants on a screened porch in Summer, leaving them out in the fall until it is quite chilly at night, then put them in my unheated basement under artificial light. Great for rooms with extra drafty windows or little to no heat in winter.

Saturday, February 28, 2009

Germinating Orchid Seeds

Creatures from the Black Lagoon!!!


Yeah, maybe not, but just as rarely seen by the average human.

What you are seeing here are orchid seeds just beginning to germinate. They are Laelia tenebrosa 'Coast Ovelins' AM/AOS x self, OSP stock# 1071, 12 days post sowing (FAST!). Orchid seeds are tiny, dust like things (see also this post), so images were taken using ~30x magnification (if I remember the lens magnification correctly) on a dissecting 'scope. The first really obvious sign of orchid germination is the presence of tiny little green balls of undifferentiated tissue. From this the first leaf and first root arise. But before any of that, if you have a sharp eye you'll notice the seeds get "fat" and more noticeable on the plate. This is the stage you are viewing now.

The seeds with the opaque mass in the center are the ones that are growing. The ones that are thin and transparent are not growing. These may germinate at a later date, but more likely they will not germinate at all. The extra fat one is a little further along. In another week or two it should be obviously green and enlarged. The image above was taken with 'normal' light. The one below was taken using blue light and a red/green filter. With this setup, you can see the presence of active chlorophyll under this setup as evidenced by the red color of the fattest seed. Chlorophyll pigments naturally fluoresce red under blue light.



They're alive!!! Eek! :)

Friday, February 13, 2009

In Bloom: Dendrobium Nobile hybrid

Dendrobium (Himezakura x Super Ise)
Dendrobium (Himezakura x Super Ise)That's right, yet another 'in bloom'. :)

This time it is a first bloom Dendrobium (Himezakura x Super Ise) seedling. Recently I've been having a mild love affair with dendrobium species, so I just decided it was time to give the Nobile's a shot. For a very long time now I have coveted noblie type dendrobiums, but somehow got it into my head that they were hard to grow. They really aren't (see below for culture information). I bought a batch of these Himezakura x Super Ise seedlings almost a year ago and they've been doing quite nicely so far. This is the first of the seedlings to bloom, but a few of the others also have buds starting. Very exciting - maybe we'll get to see a few more soon if they don't get bought up (they're listed in my shop, in bud goes first!).

Growing Nobile hybrids:
These are dwarf nobile type, reaching perhaps a height of ~18 inches (currently ~10 inches tall in 2.5 inch pots). Nobile group plants are deciduous, meaning they generally shed their leaves every year. Don't worry when the leaves start looking a little blah in winter than fall off as long as the canes look good.

Grow like a phalaenopsis in summer for light, temperature, and water, but decrease temperature somewhat in winter. If they don't flower for you they're not cool enough at night - especially if they make keikis instead of flowers. I keep my plants on a screened porch in summer, leaving them out in the fall until it is quite chilly at night (perhaps 50F at night), then put them in my unheated basement under artificial light. Some of them had already started to initiate buds when they came in for winter. They would also be great for rooms with drafty windows or little to no heat in winter. You'd be surprised how much cooler it is in your bay window than your house in the winter.

I also increase light in winter in accordance with recommendations from other growers, but given that they drop their leaves I'm not convinced that even matters. Also be aware that cooler temperatures in winter means a less frequent need for watering.

Sunday, November 23, 2008

How do I know if my orchid is in spike?


If you're new to orchids or just don't have too many, you might not yet know the early signs of flowers to come. Let me give you a short pictorial of how to tell if you Phalaenopsis is in spike with promises of blooms to come.

When the inflorescences ("spikes" in orchid geek slang) first emerge on a Phal they look like the top photo. Usually one, sometimes two protrusions, somewhat flattened on the apex and a bit upwards facing. Here you are looking at a Phal. mannii v. flava with two spikes just starting to emerge. They are marked by the red arrows. At such an early stage, it will still be a couple months before there are flowers.

Spikes of this age can easily be mistaken for young roots. In this second picture, an emerging root is circled. Notice the difference in shape and orientation. The emerging root is rounded along the length, and points slightly downward. You may also notice a difference in surface texture. Please note, however, not all emerging roots are purple. Many are green. By the same token, not all emerging spikes will be green - some are purple.


Soon enough the spike will show above the leaves. Generally it will grow in the direction of the best light source. The young tissue is pliable, so if you plan on staking it to train the spike straight now is the best time to start, adding new ties as it grows up. This is not a necessary action for most plants, and is in fact impractical for some species and hybrids that have naturally short, horizontal spikes (like Phal. bellina or violacea and some other waxy star types).

After what will seem like a FOREVER wait, you will finally see wee little flower buds start to emerge from the bracts (joints) on the inflorescence. It is very exciting. :) There's still a bit of wait for flowers, but it is SO worth it!

Monday, November 10, 2008

In Bloom: Dendrobium tetragonum v. giganteum

Dendrobium tetragonum var. giganteumIn the past year or so I've developed an obsession with dendrobium species that is gaining in momentum. Toward the beginning of this phase I purchased several seedlings of Dendrobium tetragonum var. giganteum. This is the first of them to bloom. The flowers are maybe 4-5 inches tall and vaguely fragrant, but not in a sweet and yummy way.

Dendrobium tetragonum var. giganteum

The plants are about 8 inches long - semi pendant in a pot. Possibly their coolest feature is the square pseudobulbs. The flowers are neat too.

I grow this species along with Phalaenopsis plants in small pots with a mix that is essentially the same as my paph mix. It would also be an appropriate choice for mounted culture since the canes want to grow in a pendant fashion.

Several dendrobium species and hybrids with thinner leaves seem susceptible to mites, so keep an eye out for the little buggers. I actually believe that mites come as a result of having African Violets around, as my infestations always seem to begin in the areas where I'm keeping AV's. So I now suggest preventative spraying of the violets to avoid mites.

Tuesday, August 19, 2008

Contents of an Orchid Seed Pod

This is a phalaenopsis seed pod that recently split on its own. Fortunately I found it before it sent its charges to the wind and there was plenty of seed remaining. The pod was only about 5 months, but the seeds are a nice straw color, which suggests that they are ripe and viable. I didn't inspect them any more than that though. the remnant of the pod is there on the left. It is still very green as you can see. The contents come easily out, maybe with just a little coaxing.

The fluff shown here is what remains of the pollen tubes. It serves just like the silks you see on corn. In the photo you can see there is a darkened area of the fuzz, which is where there are seeds trapped in the matrix. To give them "the red pill" and free them from the matrix, I just grasp them in the forceps and rap sharply on the metal. They fall free easily onto the paper.

Here you can see the fuzz is free of seeds now.

And finally below, my nice crop of seeds ready to be sterilized and plated on a nice, rich media.

Dry seed sowing has some challenges. A split pod allows a chance for fungal spores to get into the seeds. Spores are rather difficult to kill. So as an added measure with dry seed I use the trick of soaking the seeds 8-16hrs in a mild sucrose solution with a little wetting agent. This can encourage the spores to germinate, essentially bringing them out of their protective shell, making them much easier to kill with a quick, low concentration bleach application (I use 7% of a high strength bleach (~6 or 6.15% hypochlorite) for 7min). This is followed by several washes with sterile distilled water and then the seeds are ready to plate on media. Too high a concentration or too long an exposure will kill the seeds, so you have to balance between the best sterilization you can get with the least collateral damage.

Sunday, August 17, 2008

Protocorm Proliferation

For those of you who have heard the term, but never seen the animal, this is what protocorm proliferation looks like. For those of you who are no confused, I shall define as best I can.

Protocorm: This is the primordial bit of tissue that forms as an orchid seed germinates. The initial thing is a little ball of undifferentiated tissue (tissue who's function is undetermined and can generate any part of the plant) that after a couple months starts forming wee leaves and then roots.

Protocorm proliferation is a phenomena where the protocorm replicates itself like a stem cell forming what is called a callus in plant tissue culture. I can't explain why it happens as I don't know. Generally in tissue culture we make them with application of excess hormones.

Personally, I've seen this most often in Phalaenopsis flasks, but it can happen with any genus. Such structures will not survive outside the flask. However, they can be divided and continued in flask until they grow normally. This results in clones since the replicated protocorms from a clump are identical. This is generally how the only successful paph clones are made. The downside is since you're starting with seed, you might find later that you've propagated a plant that has dopey flowers.

Veggie Folk has reservations about this.


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Saturday, August 9, 2008

Timeline: Momma Plant to Flowering Daughter

At the prompting of Swamprad, I've decided to chat a bit more about my orchid breeding attempts. I thought a good place to start might be a time line of the waiting game that is making new plants. This is just an estimated framework based on Phalaenopsis plants. I plan to expand on some details later. Please note this is based on growing plants at home in Maryland.

** Agonize over what combinations to make. 1 week.
* Pollinate flower. Drop pollen. Bark swear words. Get down on floor and look for it. Pollinate flower. 15 min.


* Wait. Wait some more... If a cross succeeds in making seeds, it will take on average 6-12 months to mature. In many genera, you can harvest the pod before it is fully mature, though, which actually makes handling the seed easier. If its going to fail miserably, it can do so at any time.

* Harvest the pod, sterilize, and sow. 1-2hrs.
* Wait. Germination times vary considerably. Typically I find phals will germinate in less than 2 months if they're going to do it. Lets say time on this is 1 month to 1 year.


* I usually let the protocorms gain a little size before transplanting, sometimes even with a little primordial leaf forming. They're not more than little green dots when they appear. Add 2-6 months.

* Transplant to new media, once or twice, continuing in flask for another 8 months to 2 years.



* Move seedlings to compots. Grow on 12 - 18 months.
* Pot out to individual pots. Grow on 6 - 24 months.













** At this point the plants are usually near blooming size or in some cases even first bloom size already. They might take a year or so to actually make the first few flowers. Adding all this up, it takes around 4 to 7 years to get the first couple flowers on your plants from the time a cross is made. Getting to mature size takes longer. In addition to plain time, how fast they get to bloom also depends on the genetics and environment/culture.