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Agastache rugosa seeds - Korean mint

Agastache rugosa
Korean Mint, Anise Hyssop

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A perennial which is often cultivated as an annual or frequently propagated to renew it. It is adorned in summer with beautiful spikes laden with tiny, melliferous, mauve blue flowers, above dark green foliage that smells like mint. A plant with beautiful ornamental and culinary qualities, to be planted in the ornamental garden as well as in the vegetable garden. For full sun, in fertile, well-drained soil.
Flower size
1 cm
Height at maturity
80 cm
Exposure
Sun
Annual / Perennial
Perennial
Germination time (days)
50 days
Sowing method
Sowing under cover
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Sowing period March to April
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Flowering time July to October
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Description

The Organic Blue Agastache rugosa, also known as Korean Mint, is a perennial but short-lived plant that produces pleasantly scented mint foliage. In summer, it is covered with beautiful spikes filled with tiny, highly melliferous blue-purple flowers. Highly decorative in large clumps, this plant blooms for months if the faded flowers are removed. It is perfect for slightly wild areas of the garden or as a culinary plant. It thrives in full sun and fertile, well-drained soil.

Agastache rugosa is a plant from the Lamiaceae family, native to North America and growing in dry meadows. The plant is not as hardy as European mints. Although perennial, it needs to be multiplied every year or at least every 3 years. In the wild as well as in the garden, Agastache easily hybridises with other species and self-seeds abundantly. With a height of 80 cm and a width of 30 cm, it forms a herbaceous clump with an upright habit. Its angular stems are adorned with leaves which are dark green on the upper side and lighter on the underside, triangular and elongated, with roughly toothed edges, 8 cm long and hairy. They emit an aroma reminiscent of mint. It is mainly cultivated for the beauty of its long flowering spikes that appear during summer, from July to October. The small two-lipped, tubular flowers are grouped in thin, very dense terminal spikes. It is a good melliferous and nectar-rich plant.

As a perennial plant for poor soils, agastache is a marvel of simplicity with a wild appearance. It likes sun and porous soils. It is easy to grow and it can be cultivated in rockeries or in a scree garden. In hot regions, it should not lack water at the beginning of flowering. It structures natural or country-style flower beds, composed of nepetas, stipas, echinaceas, gauras, yarrows, and pennisetums. In the vegetable garden, it pairs well with thyme, summer savory, chervil, or basil. The dried flowers can be preserved in bouquets. The leaves are traditionally used in cooking as a mint substitute, or in herbal teas after drying.

Flowering

Flower colour blue
Flowering time July to October
Inflorescence Spike
Flower size 1 cm
Fragrance Fragrant, mint
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Annual
Foliage colour dark green
Aromatic? Fragrant foliage when creased
Foliage description Mint-scented

Plant habit

Height at maturity 80 cm
Spread at maturity 30 cm
Growth rate normal

Botanical data

Genus

Agastache

Species

rugosa

Family

Lamiaceae

Other common names

Korean Mint, Anise Hyssop

Botanical synonyms

Lophanthus rugosus

Origin

Cultivar or hybrid

Planting and care

Sow Agastache seeds from February to April at 15-20 °C, on the surface of a good quality compost and cover with a light sprinkling of compost or vermiculite. Keep the soil moist, but not waterlogged, and maintain in light. Place in a propagator or enclose the seed tray inside a polythene bag until germination, which takes between 30 to 90 days.

When the plants are large enough to handle, transplant them and grow on in cooler conditions until they are sufficiently developed to be planted outside. When all risk of frost has passed, acclimatise them to outdoor conditions for 7 to 10 days. Plant them in their final position outside, in full sun, in fertile, well-drained soil, keeping a distance of 60 cm between each plant.

Sowing period

Sowing period March to April
Sowing method Sowing under cover
Germination time (days) 50 days

Intended location

Suitable for Meadow
Type of use Border, Edge of border, Slope
Hardiness Hardy down to -12°C (USDA zone 8a) Show map
Ease of cultivation Amateur
Exposure Sun
Soil pH Any
Soil moisture Moist soil, well-draining, rich

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