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Mint (Peppermint) is the most intensely flavored of all commonly grown mints, containing significantly higher concentrations of menthol than spearmint — the compound that produces the characteristic cooling sensation and sharp, clean mint flavor. Peppermint is technically a natural hybrid between watermint (Mentha aquatica) and spearmint (Mentha spicata) that was first documented in England in 1696. Its essential oil is used globally in everything from toothpaste and chewing gum to digestive teas, confectionery, and pharmaceutical products. In the garden, peppermint is distinguishable from spearmint by its darker stems (often purple-tinged), slightly darker and more pointed leaves, and unmistakably stronger menthol aroma when crushed. Like all mints, it spreads by underground runners and must be contained — but its aggressive growth habit means a single plant will supply more peppermint leaves than most households can use.
All the containment rules that apply to spearmint apply equally to peppermint — grow it in a container, always. Use a pot at least 12 inches in diameter and depth, and either leave it above ground (most manageable) or sink the entire pot into a garden bed with 2 inches of rim above soil level to block runners. Peppermint is more vigorous than spearmint and will find and exploit any gap in containment. In containers, repot every 1–2 years as plants become root-bound, dividing the root mass and replanting the vigorous outer portions while discarding the central section. Peppermint grows best with consistent moisture and tolerates partial shade better than most herbs — in fact, in zones 7–9, afternoon shade is beneficial in extending the growing season and reducing the heat-induced decline in menthol concentration that occurs in very hot weather. Cut plants back hard (to 3 inches) every 4–6 weeks throughout the growing season to maintain fresh, tender new growth. Old, leggy peppermint has less concentrated essential oils and a woodier flavor. Harvest in the morning after dew has dried. Peppermint is one of the best herbs for tea: harvest fresh stems and steep 6–8 leaves in near-boiling water for 5 minutes. The plant dies back to the roots in winter but is reliably perennial in zones 3–9, re-emerging in early spring with fresh growth.
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