Attractive bilabiate purple flowers grow on short, dense, whorled spikes above stems of alternate ovate, somewhat pubescent leaves.
Plant Type: perennial
Plant Form or Habit: rounded/mounded
Plant Use: For rockgardens.
Propagation: seed division stem cuttings
Light Requirement: full sun
Flower Color: purple
Bloom Period: mid-summer
Height: Minimum: 12 inches Maximum: 20 inches
Width: Minimum: 12 inches Maximum: 24 inches
Foliage Texture: medium
USDA Hardiness Zone: 3 to 8; Heat zones 8 to 1
Water Requirements: average
Additional Comments: D. grandiflorum is sometimes referred to as D. rupestre. Our plants collapsed, perhaps because of a rainy summer paired with a dose of fertilizer.
Source: Cornell University