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Bishy Barnabees Cottage Garden

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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    🌿 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.


    🌱 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 (20°C). 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.


    📋 Plant Specifications
    Latin Name Agastache rugosa 'Liquorice Blue'
    Common Name Giant Hyssop / Korean Mint
    Hardiness H4 (Hardy - likes drainage)
    Light Required Full Sun ☀️
    Height ↕️ 70cm - 90cm (Tall)
    Spread ↔️ 45cm
    Spacing 🌱 40cm apart
    Great for 🐝 The #1 Bee Plant
    🍵 Herbal Tea
    🏰 Vertical Structure
    ✂️ Cut Flowers
    Seed Count Approx. 90 seeds per packet

    🤝 Perfect Garden Companions

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

    • 🌼 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.
    • 🌸 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.

    📅 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 🟢 🟢 🟢
    Plant Out 🌱 🌱
    Flowers 🌸 🌸 🌸 🌸

    ⚠️ 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.

    🏆 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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