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Wait until the berries turn a deep blue color and become plump and juicy. This usually occurs in late summer or early fall. Locate the fruit clusters on the plant. They will be growing on stems that extend above the foliage. Gently pull each fruit cluster from the stem with your fingers or use a pair of scissors to snip it off. Place the fruit clusters in a bowl or container. Rinse the fruit under cool running water to remove any dirt or debris. Enjoy the berries fresh, or use them in cooking, baking, or making jams and jellies. Note: Be sure to only harvest fruit from plants that you have positively identified as blue flax lilies, and never eat berries that are unripe, green, or have a bitter taste, as they may be toxic.