Wildflower plantings enhance the abundance of natural enemies and their services in adjacent blueberry fields

•A mix of native flowering plants were established to provide season-long resources for beneficial insects.•Higher natural enemy abundance was found in the flower plantings.•Over three years, natural enemy abundance increased in crop fields adjacent to the plantings.•Sentinel egg cards revealed similarly enhanced predation levels near the plantings.•Native wildflower plantings support natural enemies and the services they provide.