1 year is quite a while though, so the thing I would do before anything, is water the tree with a weak coffee solution, and spread some coffee grinds as well, about a handful. TV's average pH is 7.1, and being near the concrete of the driveway would make the area even more alkaline. This makes magnesium, manganese, boron, iron and phosphorus hard for the tree to utilize. Deficiency in any one of these causes yellowing.
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