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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.
Harvest your citrus fruit before you trim the tree, sometime in late winter to early spring. When you harvest depends on the type of citrus you grow. In Southern California, mandarins ripen primarily from October to March and Meyer lemons ripen from November to March. Pick all fruit before you attempt to prune.