Also called lobelia, they are hardy to USDA zones ... Blue Flag Iris Irises are among the best plants for light blue flowers in native garden spaces. Blue flag iris (Iris versicolor) is especially ...
Psst—these are the best perennials to grow for hummingbirds. Great blue lobelia is cardinal flower’s blue counterpart (Lobelia siphilitica, Zones 4 to 9). The two are very eye-catching when ...