Re: Growing grapes
Do you prune the vines? Pruning grape vines makes a huge difference for grape production. Without pruning the canes don’t receive enough light to stimulate fruit production; they shade themselves out. Some grape varieties are better cane pruned, and some are better spur pruned. Thompson seedless is on of the grapes that does better with cane pruning. The California cooperative extension has a lot of information on both ways to prune grapes.