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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.
Of course there are no golden rules and every chilli variety is different so be warned of generalizations. As a rough rule the smaller the pepper the more heat it will pack. The best way to know when your fruit are ready to ripen is to try and taste them at different stages. Of course once your fruit are ripe it is definitely worth you while picking them as opposed to leaving them on the plant.