Leave the berries on the plant until late summer.
Examine the plants, looking for clusters of deep red or purplish berries. Some clusters may be ready before others.
Squeeze a berry. Ripe berries will feel dry and firm yet springy. Unripe berries will feel hard, while overripe berries will feel too soft.
Taste one berry. When eaten, berries should have a bright, lemon-like tartness. Unripe berries will taste bitter.
Leave unripe clusters of berries on the plant to continue ripening. Berries will continue to ripen through autumn.
Cut berry clusters for use before the rainy season. Excessive rainfall on ripening berries will dilute their flavor.
Place the berries in sealed paper bags and leave them at room temperature to ripen for a day or two.