I would pot them up seperatly. Sounds like each plant has 5 psudobulbs, is that correct? I would put them in the smallest pot that there roots would fit into. Don't over pot them or they will get too much water and dye. I only use small bark on my 2 inch pots of oncidiums. I would use a mixture of about 1/3 small bark and 2/3 what we call medium bark. Most people also put additives into bark mixes to open up the mix. Sponge rock comes to mind. If you have no expience with orchids you might consider buying a premixed bag of orchd mix at Lowes or Home Depot.

Hope this helps.
Bob in Albnay, N.Y.

I like my oncidiums in semi-hydro pellets. Barring that, I use medium coconut husk chunks with a bit of charcoal mixed in. Otherwise they dry out too much and the leaves get all wrinkly and the bloom spikes get stuck. You kind of have to go with what you know. Maybe if you are in the fog belt bark would be better- but if you are east enough that it is dry then you might want to try the CHC.

Thanks to You, Bob, and You,Lisa,I seem to have the same problems with oncidiums, the leaves get crinkly and the spikes get stuck, would Home Depot or OHS carry coconut husk chunks or semi-hydro pellets? I would like to try them. Thanks again for coming to my "help" so promptly!!!!

Annamaria

I doubt that the big box stores will carry either of those products. You can always order something on line.

You can usually find S/H at a Hydroponics place- I reckon Berkeley ought to be chock-a-block with those. The CHC (coconut husk chunks) I get by the bale from a local small operation grower. He also tends to have giant bags of several sizes of bark, piles of cork pieces, and various sponge rock and charcoal- I bring my own bucket and he just eyeballs me a price. It takes me a couple of years to go through a bale of CHC, but it is dry and sitting on a shelf under my potting bench- I rinse a big tupperware full every so often and put it within hands reach. Your local orchid society or a show if there is one soon, should be awash with suggestions on where to get the stuff. And probably somebody willing to go halvsies with you.