The recommended pH level should be from 5.8 to 6.5. Also, raspberries require between six and eight hours of daily sunshine. The same article recommends planting early in the spring rather than in the fall. It goes on to provide the following recommendations for spacing raspberry plants in the garden. It says purple varieties should be in rows that are twelve feet apart with three feet between plants.
Black raspberries require ten feet between rows and two and one half feet between plants.
Yellow and red cultivars need ten feet between rows and two feet between individual plants. It is suggested that additional space is provided in fertile locations. This is because raspberries may contract an infection known as verticillium wilt. Invasive weeds can also pose a problem, and weeds should be pulled on a regular basis. The same article says bindweed, quackgrass, and thistle, which are all considered invasive, should be removed from the area before planting.