Garden columnist Dan Gill answers readers' questions each week. To send a question, email Gill at dgill@agcenter.lsu.edu. About a year ago, we redid our flowerbeds and added three crape myrtle trees.

Dear Neil: How can I find someone qualified to tell me if a very large tree needs to be taken down? I’ve gotten conflicting comments. You need a Certified Arborist. He or she will be a member of the ...