Some of my grapes are starting to turn purple but they are still small...like a little smaller than a marble...do they "blow up" right at the end or is that just what I've got this year?...The vines are only in their second year and I didn't thin the blooms so I may have just overloaded their ability to produce...here is a picture...oh yeah...they are a hybrid of Lenoir (Black Spanish) called "Favorite"

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