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  #1  
Old 01-15-2019, 08:35 AM
riverrat riverrat is offline
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Join Date: Jan 2019
Location: St. Augustine florida
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oncidium potting media Male
Default oncidium potting media

I am new to oncidium care. I keep mine in a greenhouse with high humidity and good air flow. They are currently potted in sphagnum but it never seems to dry out. I am worried that this is going to cause trouble in the long run. Do any of you use a bark mix for your oncidiums? I picked up 3 large Sharry baby oncidiums on sale and want to rebloom them.
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  #2  
Old 01-15-2019, 10:36 AM
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MrHappyRotter MrHappyRotter is offline
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oncidium potting media Male
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Pure moss would be a straight up exercise in frustration for me to grow most commonly available Oncidium alliance plants in. It might work for smaller, younger plants and in certain growing conditions, but once they get some size on them I'd have a hard time avoiding over watering in my home growing conditions.

So to answer your question, yes, typical bark mixes work well, and I'd guess most people are growing their Oncidium alliance plants in bark based (or comparable) media. You might also consider using semi-hydro. Since you picked up 3 plants, you could even experiment, grow them side by side in different potting mixes, and see what works best in your conditions and with your care routine.

One thing to note is that Sharry Baby has thin, wiry roots that grow best with a fair amount of moisture and don't like to dry out extensively. So, using a bark mix with a thin top layer of moss could be helpful, or using a smaller sized bark could be helpful, as well. However, once the plant starts getting large, you almost have to use standard sized large grade potting mixes to help ensure that stale pockets don't form in the middle of the pot.
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Old 01-15-2019, 03:11 PM
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estación seca estación seca is offline
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oncidium potting media Male
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Oncidiums use a lot of water. I can't keep smaller Oncidiums alive in my lower humidity unless they're in sphagnum moss. The bark dries out too fast. Sometimes I even need to stand them in dishes of water.

Differing growing conditions require different techniques; I can understand how moss would retain too much water and exclude air, in some conditions.
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