Answer: Grapevines grow clusters of tiny flowers which, if pollinated, will turn into fruits. As long as there is insect activity (bees, wasps, etc.) the flowers will be pollinated and will turn into grapes. Two years is a little young for a grapevine to produce lots of grapes so consider the ones you get to be a bonus. In another 2-3 years your grapevines will be old enough to produce a bumper crop. As the grape clusters begin to develop, choose the largest clusters with the most potential and remove the smaller clusters, and any late-developing clusters from the plants. This will help direct the plants' resources into ripening only a few clusters which will help the grapes become large and sweet.
Best wishes with your grapevines!
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