Put some used coffee grounds (not decaf) right around the trunk of the trees, at least 6-8 ounces each tree, do not immediately water these trees after placing the grounds down, wait at least 20 to 24 hours after placement, then pour 1/4 gallon of whole milk at the trunk of the trees, and over the coffee grounds, this will neutralize the acidity level in the soil and provide the trees with a much needed boost, again wait on the water. After 24 hours from the milk, aireate at the base of the trees, 3-5 holes no more than 8" in depth, then water like you normally would, it will take 5 to 9 days to get a reaction from the trees, rapeat if necessary, and you should be fine. You do not wat to repeat this procedure more than 6 times per tree, as you can damage the pith in the trunk.