Great lobelia or blue cardinal flower (Lobelia siphilitica) is a native perennial USDA hardiness zones 4-8). They bloom about a month later than cardinal flower (Lobelia cardinalis). They’re part of the late summer perennial bloom season that includes turtlehead (Chelone obliqua), asters (Symphtrictum), ‘Henry Eilers’ black eyed Susan (Rudbeckia subtomentosa). and dahlias (Dahlia spp.). Add […]