Dying Dendrobium (yellow leathery leaves)
deniba
16 years ago
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smwboxer
16 years agojane__ny
16 years agoRelated Discussions
Yellowing Oncidium leaves under CFL and daylight
Comments (9)A few leaves on the oldes pbs could yellow normally. But the yellowing shouldn't continue and continue. My guess would be dying roots. This could have begun before you even bought the plants, and is really quite a common thing in new plants that were heaven knows where before you got them, so don't get on a guilt trip. Focus on restoring the plant's vitality, which you can fairly easily do if they aren't too far gone. When roots are compromised, plants start to discard leaves. My advice would be to stop trying to get more blooms. You won't get them on an ailing plant. Also, many oncids bloom twice a year, but others only bloom once, so you can't expect new blooms til at least next summer, maybe next fall. Concentrate on restoring the plants to health, and they'll bloom for you, probably next fall. I would take them out of the pot and examine the roots. If the roots are good, make sure the pot isn't too big for the rootball, and that the drainage is good. Also make sure you do not plant it too deep-- *all* of the pbs should ride just on top of the medium, not *in* it. If the roots are bad, oncids re-root quite well in a clay pot with a little lava rock on the bottom, and then a thin layer of sphag over the lava rock. Water when the sphag is crispy. This creates a nice humid atmosphere around the the plant, and fosters new roots. New roots form only on the newest pbs, so I would also put rooting hormone on the newest pbs, at the bottom of the curve on the pb, where roots will appear. Give them the best light you have. With rooting hormone, it can take as little as a month for new roots to appear. Expect some action from them as the days get longer and the sun gets stronger. Don't fertilize until the plants have roots again. Good luck....See MoreNew Dendrobium
Comments (21)Don't remove the canes as long as they are green, they are providing energy to the new growth. I would pull it out of the pot and re pot in the same pot with fresh mix. When you put it in the pot put the old growth into the corner of the pot against the wall putting the new shoot more in the center. From the photo I would water a little more than you did last year. The canes should be fat like the ones in Jane's picture. It's normal for the old canes of these types to drop leaves after a year or two. Notice in Janes photo only the flowering canes have leaves and those plants look like perfect specimens. Don't be discouraged if it doesn't flower this year, work on getting the plant to grow making small adjustments as you go. If the new growth ends up smaller than the old ones thats a sign that something needs to change, maybe a little more light or some fertilizer. If the new growth is the same size or bigger you are very close to getting flowers. Don't use any copper based sprays on it, they hate when you do that....See MoreLatouria dendrobiums are my nemesis
Comments (10)Dunno if this will help, but here's info from FCOS (Five Cities Orchid Society, CA): LATOURIA Leaves at top of pseudobulbs are large and leathery, inflorescence erect, flowers commonly yellow-green. Species such as Den. atroviolaceum, Den. macrophyllum and Den. spectabile. Culture Same as antelope types, but cooler and drier when resting in winter. SPATULATA (Antelope type) Evergreen for several years. Most are large, vigorous plants with long-lasting flowers in summer to several times a year. Species such as Den. antennatum, Den. canaliculatum, Den. discolor, Den. gouldii, Den. johannis, Den. lineale (veratrifolium), Den. stratiotes, Den. strebloceras and Den. taurinum. Culture Warm all year (60 to 65 F nights, 75 to 90 F days); no rest period; can be kept cooler in winter if dry; medium to high light. Also, this Forum post on Dens doesn't address the Latouias specifically, but I was asking what "drier in winter" means and got useful definitions: http://forums2.gardenweb.com/forums/load/orchids/msg0116501032244.html Hope some of this helps. WC8 Here is a link that might be useful: FCOS Culture Sheets...See MoreRescue orchid help: yellow leaves after repotting
Comments (8)I have several of these dendrobiums and usually find if they yellow immediately, it's the stress from the transplant. Were the roots in good shape and did you soak the media for a while before transplanting? I know they hate being cold and I live in Michigan so in the summer I place them in a sheltered area outside but have to bring them in before any of the other orchids in the fall. I've found mine seem to do better in a type of stone media rather than bark for some reason. I have them in pots with a lot of drainage holes in the sides and bottom. Old canes will die off and turn brown eventually but still give nourishment to the new parts of the plant so I leave them alone and don't cut them off. Not the prettiest with old canes thrusting out in all directions but they always bloom every year and sometimes twice a year. My oldest one is probably about 12 years old....See Moreorchid126
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