At maturity, individual berries are full size and slightly less firm to the touch. As a final test, taste a few grapes for sweetness when berry size and color indicate the fruit is approaching maturity. Harvest grape clusters when the berries are sweet. When harvesting grapes, remove clusters with a knife or hand shears. Sound grapes can be stored in perforated plastic bags in the refrigerator for up to two months.
Raspberries are ripe when the fruit is fully colored.
Also, ripe berries slip easily from the receptacles, which remain on the plant. Raspberries are very perishable. They should be harvested every two or three days, handled carefully, and refrigerated or frozen immediately. Raspberries can be stored for only three to five days in the refrigerator. Strawberries are fully ripe when uniformly red.