i did it last march the same exact way i just did the fig tree left my dad in charge of watching it this is when i went to florida and did a little baby fig tree at the same time i came back 2 months later and the bag was full of roots had my dad cut it and he planted it at the end of last season but i actually just used potting soil plain old cheap 2 dollar bag of potting soil and im trying that other monster of a tree to get an air layer out of that one im also doing a persimmon tree that i actually started last season i thought it wouldve froze but the branch is still alive and well and plenty of moisture in the bag we will see what happens there