• Released by Walter Knott (developed by Rudolph Boysen in Napa, Calif.) in 1935
  • Exact parentage unknown, but believed to be Logan (R. ideas crossed with R. ursinus) crossed with Eastern dewberry

Boysen is a hybrid between red raspberry and blackberry, but the exact parentage is not known.  Generally thought of as a type of blackberry, given its fruit characteristics.  Fruit are large, soft, dark purple and covered with a dusty bloom.  Flavor is very good, unique.  Trailing growth habit.  High yields.