Horse Mint (Mentha longifolia)

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Sunlight Full sun to partial shade; tolerates dappled light in hot climates to prevent leaf scorch

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Watering Water when the top 2 cm of soil dries completely; avoid waterlogging to prevent root rot

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Temperature Hardy to -15°C; thrives in temperate to warm conditions; protect from prolonged extreme heat above 32°C

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Leaf: Long, lance-shaped leaves with serrated margins; grey-green, fuzzy texture
Flower: Dense whorls of pale purple to white tubular flowers in terminal spikes
Stem: Square, hairy stems typical of the mint family; spreads via underground rhizomes

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Watering

Keep soil consistently moist but not waterlogged; increase frequency in hot, dry spells

Fertilization

Diluted balanced liquid feed every 2 weeks. Discontinue fertilization in autumn to prepare for dormancy

Composted eggshell powder：Sprinkle a thin layer around the base of the plant; gently work into the top 1 cm of soil to avoid disturbing shallow roots

Pruning

Pinch back young stem tips to encourage bushy, compact growth
Remove spent flower spikes to redirect energy to foliage production
Divide overcrowded clumps every 2–3 years in early spring to maintain plant health
Trim back dead foliage in late autumn to prepare for winter dormancy

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Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no adverse effects from ingestion or contact

Humans: No known toxicity to humans; safe for culinary and herbal use

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Culture: Used in traditional herbal remedies for digestive relief and respiratory support; symbolizes refreshment and clarity

Usage: Culinary herb for teas, garnishes, and flavoring; aromatic ornamental for pollinator gardens