What should i do with Oncidiums repot or not. 6 of them

[POLKA]

repotting oncidium intergenerics are usually best done when the new growths are anywhere from one to three inches high, because that is when the new roots tend to appear.

I grow in moss, and have no problems with that, tho chunky mixes are easier for beginners.

Have fun!

Rex

[Orchid-gurl]

Ok.. last night checked the new transplants. Bulbs started shriveling and they are moist. took them out and root rot has started again.. Like on the last batch from traders joe. Donno what else to do. got the humidifier going. small bark was washed. with few clay pebbles. o dear o dear so frustrated...

[bil]

Me, I would repot in fine bark only, and treat it as tho it were OK. ie water sparingly but regularly.

[POLKA]

Add to Bil

repot slightly deeper, maybe 1/2 inch above the base of the pbulb, and set whole thing in a plastic bag with top open slightly. Shady warm place--even on a seedling heat mat--to help initiate new growth. No more water unless mix becomes bone dry. Mist a little in the bag if no moisture condensates on the inside.

And then wait.

Wait some more.

Pbulbs will stay shrivelled, but not terribly so if you keep shaded, and warm. Too much light will cause more transpiration which tries to draw moisture up thru non-existing roots, which would take moisture from the plant tissues instead.

When the new growth starts, usually 4 weeks or so after bloom spike stops, the new roots will begin to show when the new growth gets to have some size to it. The new growth will also cause a bit of shrivelling--no worries. Just keep it going until new roots show, and are about 1/2 inch long.

Then repot, and keep shaded for another month.

When the roots are obviously going thru the mix, then bring back to more light gradually.

Take care
Rex

[u bada]

Agree with POLK, repotting onc intergenerics can be a tricky affair, best to wait when new growth is 3-4" and new roots starting to grow, i'd wait even til roots are an inch long, otherwise i wouldn't repot.

maybe I'm in the minority here, but I just don't like to repot unless the medium is completely bad or it's the optimal time to do so, in my opinion it always sets plants back even by a year to jump back in there... (that's why I prefer mounted plants) unless your plant has like 20x pbs or leaves and you have a greenhouse, then whatever lol

and also to support POLKA, I think treating oncs with compromised root systems as backbulbs is a good idea, ie with a plastic bag to keep humidity up until roots start growing...

[Orchid-gurl]

Thank you so much. i will certainly do it like that. I had build new floating shelf's and put them on south facing window. Our temp has been rising with more sunshine. 55-62 F. So its drawing the moisture from the plant tissues. Makes sense, also i had them in clay pots. moved them to plastic 4" and drilled 20 ish or so holes in them all around to give it some more air. No water they are moist not bone dry and will keep the window shaded. Also put them in plastic bags top open about 1-1 1/2"

[bil]

So far my experience has been that roots are of secondary importance, but if the pbulbs are shot, you might as well bin it.