Blue Cardinal Flower Size:1 Gallon Pot The serrated bright green leaves

The serrated bright green leaves turn an outstanding purple-red in the fall

this shade loving perennial brings a bright flash of chartreuse color to your shady areas

The Rio is the best selling plant from the Cityline series

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Blue Cardinal Flower Size:1 Gallon Pot The serrated bright green leavesBlue Cardinal Flower Plants for Sale Online The Blue Cardinal Flower (Lobelia siphilitica) is a pollinator perennial known for its beautiful bright blue flowers. The trumpet shaped flowers sit atop long stems, attracting butterflies and hummingbirds. It is a hardy native perennial with large, bright green foliage and blue blooms that appear mid to late summer. The Blue Cardinal Flower thrives in a variety of conditions and can tolerate part sun or