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The color of the vine also indicates when to harvest Concord grapes. Throughout the growing season, the vine and stems are a light to medium green. When the vine and stems begin to turn to a light then medium brown, it means the grapes are ripening and ready to harvest.
Prune grape vine not later than Feb again on Fruit day with a descending moon path. In autumn take dead and diseased branches off. Most perennials can be pruned in autumn and again in spring when you would leave at least 3 buds on the stems. Never prune more that 2/3 of a plant at once. TIP: Scratch the base of stem and look if it is green or brown to reveal if itâs still alive. SHIPPING: Orders over Â£20 FREE. Otherwise UK (in Tubes) : Â£2.90/Â£3.90.