My pots have 4 holes each in the bottom for drainage (about 1 square inch holes). What can I use as a screen to prevent the medium from draining out the holes? Paper towel? Cheesecloth? Wire screening?
I harvested not too long ago and checked the felt. There were quite a few roots entwined in the felt and no other discoloration. Dirty of course but no green or white anywhere. I just potted 8 more using the same stuff.