 Rich green, all the new foliage will come out green. The foliage will be bigger. The shade from that tree will be better. And so I'd fertilize it with the 7-in-4 all-purpose food and give it sulfur at the same time. There you go. Robert, yes, be worried. If you don't do anything, it will lose leaves, start to shed, be thin, be wispy, and you will not get any fall color. It'll just be lost. Anyway.