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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.
How to tell if the pears are ripe! The fruit can be ripened on the tree, but for better quality, they are best picked early and allowed to ripen indoors. Most pears ripen from the inside out, and if left on the tree to ripen, many varieties will become brown at the core and rotten the middle.