Acquire a colony of honey bees or pollen bees to live near your boysenberry patch and benefit any flowering plants in the area. You can purchase an established hive and placed it intact in your yard.
Rent a colony of pollen bees from an apiary or pollinating service if you do not have the means or desire to properly care for or support a bee colony hive.
Refrain from applying pesticide sprays, dusts or granules from the early spring through the end of summer to prevent bees in the vicinity from being killed. Bees travel up to 1/4 mile for flowers, so any pesticide activity in this range can pose a deadly threat to them.