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Bishy Barnabees Cottage Garden Ltd

Agastache Liquorice Blue

Agastache Liquorice Blue

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Agastache 'Liquorice Blue' Seeds

If you want to see bees, butterflies, and hoverflies flocking to your border, plant Agastache. 'Liquorice Blue' produces tall, dense spikes of bottle-brush flowers in a stunning violet-blue that are richer in nectar than almost any other garden plant.

But it isn't just for the insects. As the name suggests, the foliage releases a powerful, delicious aroma of aniseed and liquorice when brushed against. It is a fantastic architectural plant, adding vertical structure to borders, and unlike many perennials, it flowers in its very first year from seed.


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๐ŸŒฟ Understanding the Plant

Agastache is a Hardy Perennial (often treated as a short-lived perennial).

Also known as "Korean Mint" or "Giant Hyssop," it originates from East Asia. It is incredibly vigorous and will bloom just a few months after sowing. While it can survive UK winters (especially in well-drained soil), it gives so much energy to flowering that many gardeners treat it as a fresh annual/biennial to ensure the best display.

The Scent: The essential oils in the leaves are strong. On a hot day, you can smell the liquorice scent wafting through the air without even touching the plant.


๐ŸŒฑ Growing Guide: How to Sow and Grow

Agastache is very easy to grow but hates wet feet in winter.

Germination:
Sow indoors from February to April. Surface sow onto moist compost and do not cover (they need light to germinate). Keep warm (20ยฐC). Germination is usually rapid (7-14 days).

Where to Sow:
Plant out after the last frost. They need full sun and free-draining soil. If you have heavy clay, grow them in raised beds or add grit to the planting hole. They are drought tolerant once established.

Care While Growing:
Deadhead: While you can deadhead to encourage more blooms, the seed heads look beautiful in winter (standing like dark skeletons) and provide food for goldfinches.


๐Ÿ“‹ Plant Specifications
Latin Name Agastache rugosa 'Liquorice Blue'
Common Name Giant Hyssop / Korean Mint
Hardiness H4 (Hardy - likes drainage)
Light Required Full Sun โ˜€๏ธ
Height โ†•๏ธ 70cm - 90cm (Tall)
Spread โ†”๏ธ 45cm
Spacing ๐ŸŒฑ 40cm apart
Great for ๐Ÿ The #1 Bee Plant
๐Ÿต Herbal Tea
๐Ÿฐ Vertical Structure
โœ‚๏ธ Cut Flowers
Seed Count Approx. 90 seeds per packet

๐Ÿค Perfect Garden Companions

The vertical blue spikes of Agastache look incredible with contrasting shapes and colours:

  • ๐ŸŒผ Rudbeckia 'Marmalade': The Colour Clash. The deep yellow/gold of Rudbeckia provides a vibrant contrast to the violet-blue of Agastache. Both flower late into the summer.
  • ๐ŸŒธ Echinacea (Coneflower): The Shape Contrast. The large, flat, daisy heads of Echinacea sit beautifully alongside the tall, thin candles of the Agastache. A classic prairie planting combination.

๐Ÿ“… Sowing & Flowering Calendar

Sow indoors in spring. Flowers July to October.

Month J F M A M J J A S O N D
Sow Indoors ๐ŸŸข ๐ŸŸข ๐ŸŸข
Plant Out ๐ŸŒฑ ๐ŸŒฑ
Flowers ๐ŸŒธ ๐ŸŒธ ๐ŸŒธ ๐ŸŒธ

โš ๏ธ Edible & Herbal
The leaves are 100% edible and are often used in East Asian cuisine. You can steep the fresh leaves in hot water for a refreshing, minty-liquorice tea that is said to settle the stomach.

๐Ÿ† Officially Recognised Excellence

Agastache is a superstar for wildlife. It is listed on the RHS Plants for Pollinators list and is widely considered one of the most effective plants for increasing biodiversity in a garden.

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