I'm sure this question has been aswered already, but I missed it: I have severe freeze damage and lost upper half of trees. New growth coming out on branches that survived two, three, four feet from ground. Vigorous sprouts coming up from base and trunk of tree. Do I remove the sprouts that are trying to form new multiple trunks to encourage growth forming higher up, or leave the trunk/base sprouts to help build trunk caliper, supply glucose to root system, and help shade trunk and protect from sunburn?