florida sea grape question


I have a sea grape hedge that is loaded with clusters of bright green grapes. I'd love to try my hand at sea grape jelly, but they are all as hard as a rock and they never ripen. Every year they put on fruit like crazy, but they all turn to a red/purple color and fall from the plant as a hard seed, never turning or softening into anything edible. Is it possible I have a non-edible variety? Is there such a thing? Any info would be helpful. Thanks :)

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