Pycnanthemum tenuifolium, the narrowleaf mountain mint, slender mountain mint, common horsemint, or Virginia thyme, is a perennial herbaceous plant in the mint family, Lamiaceae. It is native to central and eastern North America. Pycnanthemum tenuifolium is an herbaceous plant with wiry, green, branching stems from 2-3 ft tall. As with other mints, the stems are square in cross-section. Leaves are narrow, opposite, and simple, measuring up to 2 in long and less than .25 in wide. The flowers are white, borne in dense, half-round heads in summer, June through September. Unlike most plants in the genus, the foliage has a very faint mint fragrance.
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Pycnanthemum tenuifolium (Narrow-leaf Mountain Mint) - 1 gal
Narrow-leaf Mountain Mint
Plant Care & Installation Quick-Guide
Proper acclimation and installation are key to your plant's success. Please cross-reference these tips with your plant's specific ID tags:
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Pre-Planting: Store plants in a light-appropriate area on soil or grass (avoid hot concrete or asphalt) and water daily until the soil is saturated and the pot feels heavy. If temperatures drop below 30°F, move pots to a garage or cover them to prevent root freeze.
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Installation: Dig a hole matching the depth of the pot, remove the fabric container, and ensure the plant’s crown or root flare is level with the ground. Fill gaps with soil, water heavily, and apply 2 inches of mulch—keeping it clear of the stem.
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Ongoing Care: Check moisture daily by feeling 1–2 inches into the soil; water deeply at the base if the soil feels dry or warm. Newly installed plants require frequent watering (up to 3–4 times weekly in heat) until fully established, which can take a few months for perennials and up to two years for trees.