Agastache rupestris

12 Sep

Agastache rupestris (17/08/2014, Kew Gardens, London)

Agastache rupestris (17/08/2014, Kew Gardens, London)

Position: Full sun to light shade

Flowering period: Late summer to early autumn

Soil: Moist, well drained

Eventual Height: 1m

Eventual Spread: 1m

Hardiness: 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b

Family: Lamiaceae

Agastache rupestris is a fast growing sub shrub with a clump forming upright habit. Its silver/ grey leaves are linear with entire margins, up to 5cm long and 5mm wide. Its leaves are fragrant when crushed. Its orange/ pink/ yellow flowers are tubular with two lips and appear as terminal spikes.

Agastache rupestris Flower (17/08/2014, Kew Gardens, London)

Agastache rupestris Flower (17/08/2014, Kew Gardens, London)

Agastache rupestris, commonly known as Threadleaf Giant Hyssop, Sunset Hyssop Licorice Mint or Rock Anise, is native to south west USA and Mexico. In its native habitat it grows on cool mountain slopes.

The etymological root of the binomial name Agastache from the Greek agan meaning ‘very much’ and stachys meaning ‘spike’. Rupestris is derived from the Latin rupes meaning ‘rock’, referring to its preferred environment.

The landscape architect may find Agastache rupestris useful as part of a xeriscaping planting scheme. Once established this plant is drought tollerant.

Ecologically, Agastache rupestris flowers are attractive to pollinating insects. It is also attractive to Humming Birds.

Agastache rupestris Leaf (17/08/2014, Kew Gardens, London)

Agastache rupestris Leaf (17/08/2014, Kew Gardens, London)

Agastache rupestris prefers moist, fertile, well-drained soils. It tolerates most pH of soil. It dislikes wet soils. It will tolerate poor soils.

Agastache rupestris requires little maintenance. This plant may be cut back in late summer to encourage a second flush of autumn flowering. To keep a tidy, compact appearance this plant may be cut to near ground level in spring.

Davis Landscape Architecture

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