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Agastache nepetoides Fuji no Yuki

Agastache nepetoides
Yellow Giant Hyssop

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Marie-Andrée, 01/05/2020

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A giant agastache, little known and little cultivated, which offers from July to October a melliferous flowering in thin and dense spikes, chartreuse yellow to whitish on a beautiful slightly hairy but not very aromatic foliage. It is a short-lived perennial, quite spectacular, robust, hardy and undemanding. It appreciates the sun and partial shade and well-drained, moist to drier soils. A beautiful wild plant that finds its place in rock gardens, herbaceous borders, in natural flower beds.
Flower size
5 cm
Height at maturity
1.50 m
Spread at maturity
50 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -15°C
Soil moisture
Moist soil
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Best planting time March to April
Recommended planting time March to June
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Flowering time July to October
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Description

The Agastache nepetoides, commonly known as the giant hyssop in the United States, is a rather rare giant species in European gardens despite its ease of cultivation. This perennial forms a quite spectacular clump in perennial borders, large rockeries, and finds its place in naturalistic settings. It will be appreciated for its long summer to autumn flowering in thin and dense spikes, ranging from chartreuse yellow to whitish, highly visited by bees and other pollinators. Less aromatic than other agastaches, its large slightly hairy leaves are quite decorative. Undemanding, robust, and very hardy, this species enjoys full sun to partial shade and well-drained, moist to drier soils. Short-lived, it readily self-seeds in light soil.

Agastache nepetoides belongs to the Lamiaceae family, it is a cousin of mints and salvias. It is a large deciduous herbaceous plant, perennial from its stump, with above-ground vegetation that disappears in winter. It is native to North America (Connecticut, Vermont, Pennsylvania, Missouri etc.), where it is occasionally found in clearings, at the foot of cliffs, on forest edges, on slopes and rocky areas. It particularly thrives in damp groves, fields, or roadside locations, in habitats disturbed by human activity. This species adapts to various soils, but prefers well-drained ones. 

The plant forms an upright clump that can exceed 1.50 m (5ft) in height, supported by square and hairy stems with rather triangular leaves, 10-15 cm (4-6in) long, coarsely toothed at the edges, hairy on the underside, dark green in colour. The leaves are paired at each node on the stems. When crushed, they release a light menthol scent. The leaves located at the top of the stems are smaller. Flowering occurs from July to October, and continues until the first frosts. At the end of the branched floral stems, cylindrical and elongated clusters appear, measuring up to 6 cm (2in) long. Each cluster is composed of numerous small flowers with 5 petals and prominent stamens tightly packed together. The flowers open in a yellow-green colour and gradually turn to an uncertain white tone. After pollination by insects, the flowers give way to small fruits, 1.5 to 2 mm (1in) long, which do not open at maturity.

In a slightly wild area of the garden, or in a large rockery, combine this tall agastache with Schizachyrium scoparium 'Blue Heaven', Galega, catchflies, 'Buenos Aires verbena, tall yarrows, Helianthus salicifolius, or H. decapetalus 'Plenus', for example, as they are equally robust plants that have their place in a garden that makes room for nature. Echinaceas as well as tall mulleins will also be lovely companions for this quite spectacular plant. 

 

Agastache nepetoides Fuji no Yuki in pictures

Agastache nepetoides Fuji no Yuki (Flowering) Flowering
Agastache nepetoides Fuji no Yuki (Foliage) Foliage
Agastache nepetoides Fuji no Yuki (Plant habit) Plant habit

Flowering

Flower colour white
Flowering time July to October
Inflorescence Cluster
Flower size 5 cm
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Evergreen
Foliage colour dark green
Aromatic? Fragrant foliage when creased
Foliage description Slightly aromatic foliage when crushed.

Plant habit

Height at maturity 1.50 m
Spread at maturity 50 cm
Growth rate fast

Botanical data

Genus

Agastache

Species

nepetoides

Family

Lamiaceae

Other common names

Yellow Giant Hyssop

Origin

North America

Product reference855411

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Planting and care

Plant Agastache nepetoides preferably in spring in very humid regions, or in early autumn elsewhere. Choose a sunny or semi-shaded exposure. This plant succeeds in any type of well-drained, limestone, neutral or acidic soil, not too poor however and sufficiently deep to accommodate its roots. Once established, it tolerates rather dry soils in summer. Its cold resistance is excellent. This fast-growing but short-lived perennial can easily self-seed in light soil.

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Planting period

Best planting time March to April
Recommended planting time March to June

Intended location

Suitable for Meadow, Rockery, Woodland edge
Type of use Border, Back of border, Slope
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun, Partial shade
Soil pH Neutral, Calcareous
Soil type Chalky (poor, alkaline and well-drained), Stony (poor and well-drained)
Soil moisture Moist soil, free-draining

Care

Pruning instructions Prune the dry vegetation at the end of winter, when the vegetation starts growing again.
Pruning Pruning recommended once a year
Pruning time March
Disease resistance Very good
Overwinter Can be left in the ground
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