I grow on both. Having said that, if I buy a bigger Cattleya (that I don't decide to divide at the time of purchase) I will use a basket rather than a clay pot. As my older cattleyas outgrow their 6 inch pots, they are going into a basket. I just don't want to risk overpotting and rot with the bigger ones.
I use a combination of LECA and river rock (bought in bags from Home Depot and washed) as a potting mix. So, it's virtually impossible to overwater.
I use some potting medium in the basket. Also, there's this guy on ebay who sells what he calls "Plaskets" which looks like a traditional vanda basket but is much lower. I've been using those since I can put some LECA and river rock in there without it being too much.
I'm also going to experiment this year with wine-soaked cork. One of my friends (and her friends) are avid wine drinkers, and I'd like to see how that works out.
In short, even though clay pots look fabulous, I think I'm slowly moving away from them for the big girls and boys. I have 4 big grammatophyllums and I'm transplanting them into BIG plaskets this spring. I just think they are too big for clay pots now.
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