I saw a bee on this flower twice before (9/14 and today before I started my observation). I think it's a leaf-cutting bee, but I'm not sure. I did not see any bees during my 30-minute observation.
I apologize for being so late in getting data to you. I had trouble with my first planting, and this second planting is just now blooming.
As far as my yard is concerned, the closest flowering plant is an oleander that is 12 feet away.