Family: Rosaceae

Rubus loganobaccus, commonly known as boysenberry or loganberry, is a hybrid bramble resulting from the cross of European raspberry (Rubus idaeus), European blackberry (Rubus fruticosus), and American dewberry (Rubus aboriginum). The plant produces large, juicy berries with a sweet-tart flavor that are popular for fresh eating, preserves, and desserts. Boysenberries and loganberries are vigorous, trailing shrubs with thorny canes and compound leaves, requiring trellising or support for cultivation. While closely related to other invasive blackberries, they are generally grown in managed gardens rather than natural areas.

This species is not known to be naturalized in the Hawaiian Islands, and because of its vigorous growth and potential to spread, people are strongly advised not to grow it. Gardeners should avoid planting Rubus loganobaccus to prevent accidental escapes that could become invasive.

High Risk Traits:

• Naturalized in multiple temperate regions worldwide (but no evidence in the Hawaiian Islands to date)
  
• Forms dense, impenetrable thickets
  
• Climbing/smothering growth habit
  
• Reproduces vegetatively (layering, suckering)
  
• Bird-dispersed seeds
  
• Tolerates mutilation and resprouts after damage
  
• Spiny stems (some varieties)
  
• Shade tolerant
  
• Broad soil tolerance

Low Risk Traits:

• Not suited to tropical/lowland climates
  
• Not toxic to humans or animals
  
• Not a prolific seed producer
  
• No persistent seed bank
  
• Controllable with herbicides
  
• Limited to temperate climates