Pollination

• Blackberry varieties, including erect and semi-erect cultivars, usually rely on their own flowers for pollination, but trailing varieties often require pollination with another plant. This other plant can be of the same cultivar as the original plant.
  
  

Insects

• Insects, especially honeybees, help pollinate the flowers of blackberry bushes. The bees are drawn to the attractive nectar the flowers produce, since it's an important food source. When the bees move from one flower to another, they take the pollen to the other flower, helping the plants pollinate.
  
  

Varieties

• Some cultivars, such as Oklawaha, were developed to help pollinate other types of blackberry bushes. For example, Oklawaha works well with Flordagrand, and the Ouachita cultivar helps pollinate varieties such as Arapaho and Navaho, two erect thornless varieties.