Hi, I have some lilac trees all together in a little grove. This winter, I noticed that the bark on the main trunks are peeling off...curling like package ribbon as it peels. Some of them have it worse than others. I asked a tree trimmer guy about it...he said squirrels....I asked a guy at Gerten's......he said natural "molting" of the tree as it is maturing. I'm not sure it's either of those to be honest as the smaller ones are just starting to do it and I've never had this problem before and I've had this house since 2005 and these lilacs were here before I bought the house. They are starting to bloom so that is good. I have enclosed this link to get photos of the issue. http://brianharrell.com/lilac/ I would be most appreciative if you could tell me what you think the problem is and if/how it can be rectified. I love this little grove of lilacs and I really would be devastated if they had to be removed. Thank you for you help. Sincerely, Kathy~