|The leaves on some branches on one of my densiformis yews have turned a grayish color. The other yews beside it are fine. Is this caused by dogs urinating on it or is this an indication of some other problem? If it is a dog, can I put lime around the shrub?|
|Grayish foliage usually indicates dead foliage. If you suspect it is caused by dog urine, adding lime won't help the shrub, nor will it deter the dog (they are creatures of habit). You can try temporarily fencing the targeted yew to keep the dogs at bay, and rinsing the plant off as soon as possible after the dog visits. Aside from re-educating the dog (and/or the owner), there's not much else to suggest.
Best wishes with your garden!