Lobelia siphilitica (Great Blue Lobelia) This is a terrific bee plant for an area that receives regular moisture (even flooding) and part shade. It can spread and re-seed quite exuberantly when it's happy. The plant may flower its first year if started early enough, but I've found that it grows slowly in its first season. Not a long-lived perennial, but the volunteers will make up for that. I put mine next to a clump of monarda and let them duke it out.