Mentha spicata (Spearmint or Spear Mint) is a species of mint native to much of Europe and southwest Asia, though its exact natural range is uncertain due to extensive early cultivation.
It is a herbaceous rhizomatous perennial plant growing 30–100 cm tall, with variably hairless to hairy stems and foliage, and a wide-spreading fleshy underground rhizome. The leaves are 5–9 cm long and 1.5–3 cm broad, with a serrated margin. The stem is square-shaped, a trademark of the mint family of herbs. Spearmint produces flowers in slender spikes, each flower pink or white, 2.5–3 mm long and broad.
Hybrids involving spearmint include Mentha × piperita (Peppermint; hybrid with Mentha aquatica), Mentha × gracilis (Ginger Mint, syn. M. cardiaca; hybrid with Mentha arvensis), and Mentha × villosa (Large Apple Mint, hybrid with Mentha suaveolens).
It grows in wet soils. It is native to Europe and southwest Asia, but has become naturalized in other parts of the world. It is naturalized throughout the United States and Canada. It is an invasive species in the Great Lakes region of North America where it was first sighted in 1843.