There are probably several things going on. It is possible that this tree is getting too much love and is being overwatered. Horticulturist Dr. Lelia Kelly says if a plant is not doing well, look at the roots. Looking at the pictures the are roots exposed. The tree may be planted too shallow. Also, some of the roots look like they are circling and possible girdling the tree. This tree probably needs to be dug up, the roots “un-circled” and replanted at the correct depth.
28 июл 2017