Care - I realize that is not the answer you are asking for but my experience is the good ones (JTT) don't shed much once in place and left along. Trees that lose a lot I do throw away but those are few and far between. I try to dust them once a year, etc., and some folige does come off occasionally. I make no attempt to glue it on if it does. I am just careful and they seem to last a long time - at least five years or more (so far)