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How to Grow Korean Mint

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Korean Mint

Agastache rugosa

herb

Korean mint is a perennial herb with aromatic foliage and attractive purple-pink flowers that bloom in late summer. It has a pleasant anise-like fragrance and is commonly used in Asian cuisine and traditional medicine. The plant attracts pollinators and hummingbirds, making it a valuable addition to gardens.

When should you plant Korean Mint in your zone?

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Example Korean Mint timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Korean Mint

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Korean Mint

    Around Jun 16

    ≈ 60 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Korean Mint dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun to partial shade, 6+ hours of direct sunlight daily
💧
Water: Moderate watering; allow soil to dry slightly between waterings. More drought-tolerant once established. Reduce watering in winter.
📏
Spacing: 18 inches
📅
Days to maturity: 60-90 days to flowering
🌱
Planting depth: Surface sow or lightly press seeds into soil; needs light to germinate

Soil

Type: Well-draining loamy soil
pH: 6.0-7.0
Amendments:
compost organic matter perlite for drainage

Growing Zones

Find your zone →

Thrives in zones 5-9

5a 5b 6a 6b 7a 7b 8a 8b 9a 9b

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Growth Stages

1

Seed Germination

1-2 weeks

Tiny seedlings emerge with first true leaves appearing within 1-2 weeks

Keep soil consistently moist but not waterlogged. Provide light for germination. Thin seedlings to proper spacing once they develop 2-3 leaves.

2

Vegetative Growth

4-6 weeks

Plant develops multiple stems with opposite, lance-shaped leaves with a crinkled texture

Pinch growing tips to encourage bushier growth. Water regularly and fertilize with balanced fertilizer every 3-4 weeks. Mulch around base to retain moisture.

3

Pre-flowering

2-3 weeks

Plant becomes fuller and buds begin to form at stem tips

Continue regular watering and reduce nitrogen fertilizer to encourage flowering. Ensure adequate sunlight. Remove any diseased leaves.

4

Flowering

6-8 weeks

Dense purple-pink flower spikes appear at the top of stems; foliage remains aromatic and green

Deadhead spent flowers to encourage continued blooming. Water consistently during hot weather. Harvest leaves for fresh use or drying.

5

Seed Production & Dormancy

4-6 weeks

Flowers fade and seeds develop in seedheads; foliage may decline in fall

Allow some flowers to remain for self-seeding or seed collection. Cut back plant in fall or early spring. In cold zones, mulch over winter.

Companion Planting

Plan your garden →

Plant with:

basil thyme marjoram echinacea black-eyed susan salvia bee balm

Avoid planting near:

fennel dill

Common Pests

  • Spray with water to dislodge; use insecticidal soap if severe. Increase humidity around plants.

  • Ensure good air circulation. Remove affected leaves. Apply sulfur dust or neem oil. Avoid overhead watering.

  • Use yellow sticky traps. Spray with neem oil or insecticidal soap. Remove heavily infested leaves.

Uses

🍳

Asian Cooking & Tea

Culinary

Korean mint leaves are traditionally used in Korean, Japanese, and Chinese cuisines for soups, stir-fries, and herbal teas. The anise-like flavor pairs well with seafood and light broths. [source]

💊

Traditional Herbal Medicine

Medicinal

Used in traditional Chinese and Korean medicine to aid digestion, reduce fever, and relieve cough. Contains essential oils with anti-inflammatory properties. [source]

🦋

Pollinator Attraction

Wildlife

The nectar-rich flowers attract bees, butterflies, and hummingbirds, making it excellent for pollinator gardens and supporting beneficial insects. [source]

🏠

Fragrance & Dried Herb Storage

Household

Dried leaves and flowers can be used in potpourri, sachets, and herbal arrangements. The dried plant retains its pleasant aroma for months. [source]

🎨

Herbal Crafts

Craft

Dried flower spikes add texture and color to dried flower arrangements, wreaths, and floral crafts. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Harvest leaves anytime after the plant is well-established, pinching from the top to encourage bushiness. Best flavor just before flowering. Harvest flowers when they open for fresh use or drying. Cut stems in the morning after dew dries for maximum essential oil content.

Fun Facts

  • 🌱 Korean mint is also called 'purple giant hyssop' and is native to Korea and Japan, where it has been cultivated for centuries in traditional gardens.
  • 🌱 The essential oil in Korean mint contains thymol and carvacrol, compounds also found in oregano and thyme, contributing to its aromatic and medicinal properties.
  • 🌱 Unlike some herbs, Korean mint is winter-hardy in many regions and often self-seeds in the garden, returning reliably year after year.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Deadhead Full Sun Germination Mulch Partial Shade Perennial True Leaves
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