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I have a Thompson seedless grapevine which has produced lots of grapes for several years. Each cluster has many grapes. The problem is, the individual grapes are only about as big as my thumbnail. How can I get bigger grapes? Will fertilizer do it, or only make the vine more vigorous (it already grows very well). What about removing some clusters so the plant can put more energy into the remaining ones? I know this works for giant pumpkins. Please help!