Gooseberries can be refrigerated at 35 to 40oF for approximately two weeks. There are several indicators of grape maturity. The color, size, sweetness, and flavor of the berry are the most useful indicators. Depending on the variety, the berry color changes from green to blue, red, or white as the grapes approach maturity. Color alone, however, should not be the sole basis for harvesting grapes.
Many varieties change color long before the grapes are fully ripe.
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 they are approaching maturity. Leave the grape clusters on the vine if the fruit are not sweet. When harvesting grapes, remove clusters with a knife or hand shears. Grapes can be stored in the refrigerator for up to two months.