Deep purple to dark blue tubular flowers are produced in clusters throughout the warmer months on this nonhardy shrub native to the American tropics. Plant 'Royal Blue' in full sun, average soils, water during droughts, and watch the hummingbirds flock to the flowers. It prefers the warmer temperatures of mid-summer to early fall, and is insect and pest resistant.

Archived Copy: This content was captured before February 2022, and is no longer being updated.