Culture: Easily grown in average, medium moisture, well-drained soils in full sun to part shade. Best in full sun. Good soil drainage is essential. Plants will perform poorly and may not survive winter in hard clay soils that retain moisture. Plants tolerate heat and some dry soils once established. Deadhead spent flowers to promote additional bloom. Leave leaf and flower stems up during the winter for additional protection, cutting back the dead stems in late winter to early spring. Sandy/gravelly mulches will protect plants and help to avoid onset of rot. Plants may also be grown in containers (pinch back foliage tips in spring to limit mature plant height). Take cuttings from containers in late summer for overwintering.
Noteworthy Characteristics: When in full bloom, the flowers of ‘Purple Haze’ create an impressive bluish-purple haze in the garden, hence the cultivar name. This is an upright, clump-forming giant hyssop that grows to 32″ tall. It features a summer-to-fall bloom of tubular, 2-lipped, smoky bluish-purple flowers that bloom in whorls on erect, terminal, salvia-like spikes (to 12″ long) atop strong, rigid stems. Aromatic (anise scented), lance-shaped to ovate leaves are blue green. Flowers are attractive to bees, hummingbirds and butterflies. Agastache comes from the Greek words for “much” (agan) and “grain stalk” (stachys) in reference to the flower spikes. Zones 6 to 9.
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