Will planting blackberry and raspberry bushes next to each other cause them to die? How about within 3 feet of each other?
Planting Berry Bushes
Certified GKH Gardening Expert
You can plant them within the same area as long as they are all domesticated varieties and certified virus free. Do not plant wild varieties of any kind of berry near domesticated ones as the wild varieties may carry diseases. Wild blackberries can carry fungus and viruses that can make your raspberries sterile (more information here: https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberries-not-fruiting.htm).