Azure Monkshood is a late-blooming perennial from central China that earns its name autumn-flowering monkshood designation through dense spikes of hooded flowers in shades of deep purple and pale blue appearing from August through October. Growing 24 to 36 inches tall (potentially reaching 48 inches in ideal conditions) with a spread of 18 to 30 inches, this tuberous-rooted beauty thrives in hardiness zones 3 through 7 and requires moderate moisture and moderate maintenance. Its showy panicles, typically reaching 8 inches long, unfold atop rigid, leafy stems that rarely need staking, making it a low-fuss addition to borders and shade gardens where cool nights prevail.
Partial Sun
Moderate
3-7
36in H x 30in W
—
High
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Azure Monkshood blooms later than nearly all other Aconitum species, extending color into the cool season when most flowers have faded. The dense, hooded flower spikes reach 8 inches long and display a striking contrast between deep purple interiors and paler blue outer petals. Deer leave it untouched, and its sturdy, rigid stems stand upright without requiring support, simplifying garden management considerably.
Azure Monkshood serves as a late-season border perennial and cut flower, prized for extending garden color well into autumn when most flowering plants have begun their dormancy. Its vertical growth habit and showy spikes make it valuable for adding height and structure to mixed perennial beds, particularly in cool-climate regions where its preference for nights below 70°F ensures vigorous growth.
No timeline data available yet for this variety.
Cut back stems after flowering to encourage a second bloom flush in late season. The plant generally does not require staking or other structural support due to its naturally rigid, upright stem habit.
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“Aconitum carmichaelii originates from the mountains of central China, where it evolved as a late-season bloomer adapted to cool alpine conditions. This botanical variety, var. angustius, represents a cultivated selection within the species, refined over generations for garden performance in temperate climates. Its arrival in Western horticulture reflects the 19th and 20th century wave of plant exploration in Asia, when botanists and collectors brought seed back from remote regions to nurseries and botanical gardens, eventually making it available to home gardeners seeking late-season perennial color.”