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Boysenberries go into dormancy during the winter season, so right before they start new growth is the best time to transplant. Check the soil on occasion, and plant when the ground has thawed after the last freeze of the season. Boysenberries are pretty resilient in the face of cold weather, so they can handle if it stays cold for a little while after you plant them. Plants grow into full size throughout the summer. Planting depth varies depending on the starting size of plants, but use this as a guide. Plant them about as deep as the container they start in. It's better to start with a larger hole than you need because you can fill it in as needed. Add at least a heaping handful of brown material compost or animal manure to the bottom of the hole. This helps give the plant a nutrient boost as it takes root in the soil. If you don't have your own compost, buy some at a garden store. If you want to add a big shovelful, it won't hurt. Also, mix some compost into the soil you'll pack around the plant once you bury it. Once the growing area is all ready, place the plant into the hole. Shovel dirt around the roots and pack it down. Place a small layer of compost or manure around the base of the plant once it's buried in the ground. Boysenberries keep growing as much as you let them. It's important to give them a minimum of three feet (.9 m) to spread before they touch another plant. If you have the room, planing them five feet (1.5 m) apart leaves them plenty of room. If you don't have much room, you may want to consider only planting one or two plants. Otherwise, set your plants up in more than one space in your yard so they have room to grow. Another option, if you have limited space, is to grow the plants in containers. However, keep in mind that container-grown plants will need heavy pruning in order to keep the plant from getting oversized.

Summary:
Plant at the end of winter or start of spring. Dig one foot (.3 m) deep by one foot (.3 m) wide holes. Add well-rotted compost or manure to the hole. Place a plant into each hole. Space boysenberry plants three to five feet (.9-1.5m) apart.