Answer: Grapes generally do not need fertilizer unless the leaf color is pale or yellowing. If so, you can feed with a 10-10-10, about a half cup per plant. Strawberries can grow lots of foliage and very few berries if they are over fertilized so don't feed unless the growth is poor or the leaves are yellow. You can use 10-10-10 at one pound per 100 feet of row.
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