Our well established (10 - 15 years old) weeping atlas cedar was damaged; partially because a nearby smoke tree was blocking some light but primarily because the person who pruned the smoke tree knocked the growth off the top of a 5 - 6 foot section of the primary trunk. that middle section now has only thin scraggly extensions hanging off the bottom of it, not the normal growth that also cascades over the top. It was a gorgeous tree and I'm miserable. Is there something I can apply to the top of the damaged trunk to encourage regrowth? Is there any chance this will fill in again since it's late winter? Is my best choice to cut it back so there isn't a weird, sparsely green area in the middle of it? help!