The flowers of the blue Salvia are much too deep for any bee to reach the nectar from the front like a humming bird or butterfly might. However, the bumble bees solve this problem by piercing a hole in the bottom of the flower to reach nectar.
This morning I saw one honey bee moving from flower to flower, and wondered what it was doing since I believed it was physically impossible for her to get anything from these flowers. Upon closer inspection, I discovered that she was taking nectar through the pierced holes that the bumble bees leave behind!
I was so proud of my innovative little girl, but do realize that the summer dearth is about here and they've got to be creative with diverse nectar sources until fall.