Catasetum expansum

[Shirley]

Nancy, I love the colouring of the Los Tres Pasas! I have pseudobulbs for a species expansum but they refuse to put out a decent growth though they appear green and healthy enough, though a bit shrivelled. I have them in a plastic bag at the moment with a bit of moss and there is a 1/2 inch root and a "nubbin" but they don't seem to be growing any larger. Any hints??

[nancy]

Originally Posted by Shirley

I have pseudobulbs for a species expansum but they refuse to put out a decent growth though they appear green and healthy enough, though a bit shrivelled. I have them in a plastic bag at the moment with a bit of moss and there is a 1/2 inch root and a "nubbin" but they don't seem to be growing any larger. Any hints??

Hi Shirley - our zones are pretty different; Catasetum growth is well advanced here by now, and a few plants have even lost some foliage already...but, I do not de-pot (or un-mount) in dormancy, and keep divided pseudobulbs bare-root until the new growths are pretty advanced, and root growth is 4" or so. Sphagnum moss = ~satan~. Our humidity is high, so 'misting' (whatever that is!) is not an issue, either.
If it were me, I'd keep the bare pseudobulbs in a dry, bright place until there is enough visible growth to pot it up. Sphag/bag has never worked for me, and catasetums don't respond too well to moisture during dormancy.
My .02! Nancy

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[Shirley]

Hi Nancy, Thanks very much for your suggestions. I'll take it out of the bag and try leaving it absolutely dry. I'm also wondering if it hasn't been receiving enough light. I have a sad feeling that it's completely stalled but will keep fingers crossed!