Grape vine or not?

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Hi, my husband & I found this vine near our compost pile the other day, under our big Catalpa tree. It's growing all over our unused tomato cages! Beautiful. I clipped one vine for these pictures. Saw only one little purple grape (?) shown in the picture below, the rest were green. The pictures I saw online showed grape leaves that were jagged around their edges so now I'm wondering if this is really a grape or not. Does anyone know? If so, is it edible? Thank you! :)
grape vine or not, gardening
grape vine or not, gardening
grape vine or not, gardening
  16 answers