There are lots of embryonic grape clusters like this one on this particular vine in full sun. We've gotten a few grapes in the past, but most of these clusters shrivel before producing fruit, and the grapes are pretty small...like large peas.
This year I'm going to try giving the vine a daily bucketful of pond water in addition to the water it gets from the drip system. I am guessing that our limited grape production is due to either not enough water or not enough fertilizer, and pond water ought to fill in both gaps nicely. There were two vines in this location, on either side of an arbor, but one didn't make it through our last summer, I assume because of a watering issue.
We have two older grapevines, planted on the fence behind the lemon tree, but they never have produced grapes. I think it is too shady for them. We have four younger grapevines on the side fence where we replaced bougainvilla, but they're too young to expect fruit production.
No sign of grape leaf skeletonizers...yet.
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