Mentha longifolia (Horse Mint)

Scientific Name

Mentha longifolia (L.) L.

Common Names

Horse Mint, Wild Mint, Biblical Mint, Silver Mint, Brook Mint, Water Mint, Long-leaved Mint


Mentha longifolia var. longifolia, Mentha candicans, Mentha fluvialis, Mentha grisella, Mentha mellifluens, Mentha mollissima, Mentha sedunensis, Mentha serrata, Mentha spicata subsp. longifolia, Mentha spicata var. longifolia, Mentha suavis, Mentha tenorei, Mentha uliginosa, Mentha vermiciformis, Mentha virgultorum, Mentha weinerniena

Scientific Classification

Family: Lamiaceae
Subfamily: Nepetoideae
Tribe: Mentheae
Genus: Mentha


Color: Pale purple or white
Bloom Time: Summer


Mentha longifolia is a spreading perennial with hairy, green to grey-green leaves with a musty, minty smell. It grows up to 4 feet (1.2 m) tall. The leaves are up to 4 inches (10 cm) long and up to 0.8 inches (2 cm) wide. Branched, tapering spires of tiny, pale purple or white flowers are produced from mid to late summer.

Mentha longifolia (Horse Mint)
Photo via


USDA hardiness zone 6a to 9b: from −10 °F (−23.3 °C) to 30 °F (−1.1 °C).

How to Grow and Care

Mint is one of the few culinary herbs that grow well in shady areas, although it can handle full sun if kept watered.

Mint cuttings will root easily in soil or water, and mature plants can be divided and transplanted. However, you can start new plants from seed. Sow outdoors in late spring or start seed indoors about 8 to 10 weeks before the last frost. Keep soil moist until the seed germinates.

Mint prefers a rich, moist soil with a slightly acidic pH between 6.5 and 7.0. If the soil is somewhat lean, top-dress yearly with organic matter and apply an organic fertilizer mid-season, after shearing.

To contain the roots and limit spreading, you can grow Mint in containers, above or sunk into the ground. Be careful to keep container Mints from flopping over and touching the ground. Stems will root quickly if given a chance. See more at How to Grow and Care for Mint Plants.


It is native to Europe, excluding Britain and Ireland, western and central Asia, and northern and southern (but not tropical) Africa.


Photo Gallery

Subscribe now and be up to date with our latest news and updates.

We participate in the Amazon Services, LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliate sites.