Great blue lobelia is cardinal flower’s blue counterpart (Lobelia siphilitica, Zones 4 to 9). The two are very eye-catching when planted together. Great blue lobelia prefers a bit more sun but ...

A popular choice for pollinator beds, blue cardinal flower (Lobelia siphilitica) attracts bees, butterflies and numerous other beneficial species. Large plants that reach 4f. (1.2m) at maturity ...