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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.
Pear (Pyrus communis). Pears should be harvested just before they are ripe. Pick them when they change from a dark green colour to a light or yellowish green, but before they turn yellow. At this stage they will be firm, not soft. If left to ripen on the tree the flavour will not be as good.