Ask a Question forum: Oncidium Orchids

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Nov 8, 2016 7:03 AM CST
What can be done with Oncidium pseudobulbs that are brown and shrinked ?????
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Name: tarev
San Joaquin County, CA (Zone 9b)
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Nov 8, 2016 10:40 AM CST
I will just leave it intact for now. Looking at your photo, there are only two pseudobulbs and one of them drying out. It is still giving energy to the other one you have there, especially on the new one growing at its base. You may want to step up watering of your Oncidiums. They are always water hungry here in my area. I try to maintain at least 3 or 4 pbs intact together, whether one is drying out or not, eventually the plant will just make new ones where the new bloom stalk will come from later.

Typically if it is still summer time in my area, and our temps are just relentlessly hot and dry, I soak the root zone in water and it really enjoys it. But when temps begins to fluctuate with the seasonal changes, got to give them good watering intervals and more warmth. I don't do the water soak during Fall and Winter..only during our long dry warm months. It really improves my Oncidiums' pseudobulbs.
[Last edited by tarev - Nov 8, 2016 10:46 AM (+)]
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Name: Elaine
Sarasota, Fl
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Nov 8, 2016 3:19 PM CST
I agree with tarev. It looks like that pseudobulb still has a green leaf on it so you should leave it be. Since it is turning brown, it probably won't recover but it is still supplying energy to the plant until the leaf dies and the whole thing dries and is completely brown.

The shriveled pseudobulb is an indication that you weren't watering enough during the dry months. The plant was feeding off the stored water and nutrients in that pseudobulb. I would give it a good soak now, and then step up your watering routine. Oncidiums are generally more water-loving than other orchids, even here in FL where it is so very humid in summer.

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