By Nuffield
United Kingdom 
I am growing a grapevine in my greenhouse, this is the second season, the vine is showing signs of lots of grapes, however will I need to cut back rapid new growth to help grapes develop?
30 May, 2011
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Around here, the vigorous new growth is pinched back only for size control--the more leaves, the sweeter the grapes. Because of your shorter growing season, you might want to prune lightly to make sure that the fruit is exposed to the sun.
31 May, 2011