i don't know much (or anything) about gardening so forgive my global ignorance, but i need help with my japanese maple. it is old, about 5' x 8', i don't what variety, and was transplanted about two years ago. it was doing well until this spring when it has failed to produce any leaves while other JMs have fully bloomed. the base of the tree was covered with ground cover and rocks, and not knowing anything about plant disease i am assuming that is the problem, but i don't know. can anyone offer advice? thanks. please see below, reply #4, where i have added new and old PHOTOS of the tree. thanks.