Answer: Cranberries can begin to ripen in mid-September right into November so I can't give you an exact date, but start checking the fruits in mid-September for flavor and crispness. Commercially, cranberries are wet harvested. That is, the entire bed of plants is flooded with water and the ripe berries float to the surface and are skimmed off with machines. That's not too practical in a home garden, though, so you'll probably just handpick them one by one or grasp an entire branch with berries, hold a bucket beneath, and comb or rake the clusters with your fingers. Ripe fruit will fall right off the branches. You may have to harvest 2-3 times to get all the ripe fruit from your bush. Enjoy!
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