How to Grow Korean mint
Wikimedia Commons
Korean mint
Agastache rugosa
herbKorean mint is a fragrant perennial herb native to East Asia, known for its distinctive anise-like aroma and attractive purple-pink flower spikes. It grows 2-3 feet tall and is valued in culinary, medicinal, and ornamental applications. The herb produces nectar-rich flowers that attract pollinators and hummingbirds.
When should you plant Korean mint in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Korean mint timeline · Pittsburgh, PA (Zone 6b)
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Plant Korean mint
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Korean mint
Around Jun 26≈ 70 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Korean mint dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-9, with best performance in zones 6-8
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Get my Korean mint timeline →Growth Stages
Seedling
2-3 weeksTiny leaves emerge and develop true leaves within 2-3 weeks
Keep soil consistently moist but not waterlogged. Provide bright indirect light. Thin seedlings to prevent overcrowding.
Vegetative
3-6 weeksPlant develops sturdy stems and lance-shaped aromatic leaves; reaches 6-12 inches tall
Pinch off top growth to encourage bushier habit. Maintain moderate moisture. Begin fertilizing biweekly with balanced fertilizer.
Growth/Establishment
4-8 weeksPlant reaches full size of 24-36 inches with dense foliage and developing flower buds
Support tall varieties with stakes if needed. Reduce nitrogen fertilizer to promote flowering. Continue regular watering during dry spells.
Flowering
6-12 weeks (can extend into fall)Tall spikes of purple, pink, or white flowers emerge from stem tips; attracts pollinators
Deadhead spent flowers to encourage continuous blooming. Harvest leaves just before flowering for peak flavor. Maintain consistent moisture.
Seed maturation/Dormancy
Variable based on climateFlowers fade and seeds develop in brown capsules; plant gradually declines as temperatures cool
Allow some flowers to go to seed if desired for self-seeding. In cold zones, cut back after first hard frost and mulch for overwintering.
Common Pests
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Spray with water to dislodge; use neem oil or insecticidal soap if infestation is severe
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Improve air circulation; apply sulfur dust or baking soda spray; remove affected leaves
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and
Hand-pick in early morning; use copper tape barriers; encourage beneficial predators
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Use yellow sticky traps; spray with neem oil or insecticidal soap
Uses
Asian cooking & beverages
CulinaryKorean mint leaves add an anise-like, slightly minty flavor to soups, stir-fries, rice dishes, and Vietnamese cuisine. Fresh or dried leaves steep into aromatic herbal teas. [source]
Traditional herbal medicine
MedicinalUsed in traditional Asian medicine to aid digestion, reduce inflammation, and relieve respiratory discomfort. The essential oils have antimicrobial properties. [source]
Garden & pollinator plant
OrnamentalShowy flower spikes add vertical interest and color to herb gardens and borders. Highly attractive to bees, butterflies, and hummingbirds, making it excellent for pollinator gardens. [source]
Dried arrangements & fragrance
HouseholdDried flower spikes add texture to floral arrangements and dried herb bundles. Dried leaves release fragrance when crushed, useful for potpourri and sachets. [source]
Beneficial insect host plant
WildlifeServes as a host plant for certain butterfly and moth species while providing nectar for numerous beneficial insects, supporting garden ecosystem health. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Begin harvesting leaves once plant is 6-8 inches tall, pinching from the top to encourage bushiness. For best flavor, harvest in early morning after dew dries. Continue harvesting throughout the growing season before flowers fully open. Cut stems just above leaf nodes to promote regrowth. In frost-prone zones, cut back plant to 2-3 inches above ground in fall and mulch for winter protection.
Fun Facts
- 🌱 Korean mint is also called 'Indian mint' or 'wrinkled giant hyssop' due to its textured leaves and belongs to the Lamiaceae (mint) family, though it's more closely related to hyssop than true mint species.
- 🌱 The plant has been used for centuries in traditional Korean, Chinese, and Japanese medicine and cuisine, and is a key ingredient in Vietnamese summer drinks and herbal remedies.
- 🌱 Korean mint self-seeds readily in gardens, making it a perennial that can spread naturally if flowers are allowed to mature; in cold zones where it doesn't overwinter well, treat it as an annual or protect heavily with mulch.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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