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hi all
       i wonder if you lot can help me and my mate he has a grape vine in his green house but when the grapes start to ripen they split any ideas

In my experience this is caused by erratic water intake - especially heavy rains after a prolonged period of dry hot weather. I believe some varieties are more susceptible than others, and that larger sized grapes seem to split more easily that smaller sized grapes.

thanks 4 the info  :)