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To grow boysenberries, start at the end of winter or beginning of spring, and dig 1-foot deep by 1-foot wide holes that are 3-5 feet apart in a spot that gets a lot of sunlight throughout the day. Next, add compost or manure before setting a boysenberry plant in each hole and covering its roots with dirt. Once the plants are in, water them at least once a week to keep the soil moist. Additionally, set up a trellis, and tie your plants as they grow to keep them upright. Then, wait a full year after planting to harvest your boysenberries. For tips from our Gardening reviewer on how to protect your plants from pests and disease, scroll down!