Ooh I'm jealous of your champagne. I'm also using champagne corks, but not the expensive kind. More in the $10-$12 range, hehe. I just brought a new dendro home yesterday and sort of randomly decided to use the corks under the pot for more air. I'm waiting to repot until flowering's done, and I had been planning to use a bark medium, but after reading this thread maybe I will try a pot full of corks instead. It's my first dendro but from what I understand they like it dry and airy, which seems to make sense with corks. Perhaps a cork / bark mix?