The pot towers I use are to keep the rain we get out, and I use the dry peat moss (bought in vaccuum packed bales) to keep moisture away from the p-stem and provide insulation. It is a porous medium, so air can still move through it. It really is a balancing act, trying to keep the p-stem alive without decay because of too much moisture or humidity. Without air circulation, moisture will condense on plant material not protected in some fashion. Lots of things being tried out there, one of us will find the answer! Don't wrap in plastic! Think about that head of lettuce left too long in a bag in your refrigerator....not a pretty sight! Good luck all!
