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Agastache Danish Delight - Giant hyssop

Agastache x hybrida Danish Delight ®
Anise Hyssop, Giant Hyssop

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This hybrid variety forms an upright clump with sturdy stems, and bears dense spikes of bright, luminous magenta to fuchsia pink all summer long. When crushed, its foliage releases a peppermint scent. Plant it in full sun, in rich, well-drained soil. It is hardy to -15°C.
Height at maturity
70 cm
Spread at maturity
45 cm
Exposure
Sun
Hardiness
Hardy down to -15°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time March to May, October to November
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Flowering time July to September
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Description

Agastache ‘Danish Delight’ is an aromatic perennial with an upright habit, producing large magenta-pink spikes throughout the summer. This eye-catching flowering is visible from afar, rising above green foliage; the foliage is peppermint-scented when crushed. Plant it in full sun, in a perennial bed, a tall border, or in a large container. Charming and natural, it pairs perfectly with ornamental grasses and meadow flowers.

This agastache belongs to the Lamiaceae family, like sages, mints and catmints. It is a hybrid, sometimes sold under the name Agastache ‘Danish D’.

'Danish Delight’ is a perennial plant: its stems die back or dry out in winter, then regrow in spring. Tina Moeller selected it in Aabybro, Denmark, after a cross-breeding made in 2016 between Agastache ‘Blue Boa’ and another hybrid selection. The variety was retained in 2017, then propagated by cuttings. The fast-growing plant forms an upright and vigorous clump. It develops quadrangular, slightly hairy stems, typical of many Lamiaceae. Allow for approximately 70cm in height for the foliage, 80cm at flowering time and 45 to 50cm in width. The aromatic leaves are opposite on the stems, simple, ovate with a slightly heart-shaped base, strongly toothed on the margin, finely hairy. Flowering repeats from late June or July until September-October depending on the climate. The flowers are small, tubular and formed of two lips, enclosed in purple calyces. They cluster in whorls around the floral axis and form erect, thick, dense spikes, magenta pink to violet fuchsia. In heavy soils, stagnant water is more likely to kill the plant than dry cold.

Plant this agastache in groups of three to five, in the middle of a sunny border or in a wide flowering border. You can pair it with Panicum virgatum ‘Hanse Herms’, a large ornamental grass whose foliage turns red in summer. In the front, shorter Coreopsis ‘Mercury Rising’ will offer red flowers at the base of the border. Add  Echinacea purpurea ‘Green Twister’, for example, with green and magenta petals. Sow love-in-a-mist and cornflowers among these perennials to lighten the overall effect.

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Agastache: planting, growing and care
Family sheet
by Valérie 12 min.
Agastache: planting, growing and care
Read article

Flowering

Flower colour pink
Flowering time July to September
Inflorescence Spike
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour green
Aromatic? Fragrant foliage when creased
Foliage description Peppermint fragrance when crushed

Plant habit

Height at maturity 70 cm
Spread at maturity 45 cm
Growth rate fast

Botanical data

Genus

Agastache

Species

x hybrida

Cultivar

Danish Delight ®

Family

Lamiaceae

Other common names

Anise Hyssop, Giant Hyssop

Botanical synonyms

Agastache hybrida ‘Danish Delight’, Agastache ‘Danish D’

Origin

Cultivar or hybrid

Product reference26134

Planting and care

Plant Agastache 'Danish Delight' in spring, after the last hard frosts, or in early autumn in regions with mild winters. Choose a sunny, warm, and open position. This perennial requires a light, well-drained, fairly rich soil, even slightly lime-bearing, and particularly dislikes stagnant moisture in winter. In clayey, heavy soil, add gravel, coarse sand, or a drainage layer at the bottom of the hole. Water regularly for the first few weeks, then only during drought once the plant is well established. Avoid adding manure, which softens the stems and shortens its lifespan. 
It is not particularly prone to diseases or pests, except for powdery mildew, which can affect the leaves during drought.

Planting period

Best planting time March, October
Recommended planting time March to May, October to November

Intended location

Suitable for Meadow
Type of use Border
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun
Soil pH Neutral, Calcareous
Soil type Chalky (poor, alkaline and well-drained), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Moist soil, well-drained

Care

Pruning instructions In spring, cut off the dry inflorescences and clean the clump. Remove faded spikes to prolong flowering.
Pruning Pruning recommended once a year
Pruning time March to April
Disease resistance Good
Overwinter Can be left in the ground

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