A fast-growing tropical grass that produces thick, fragrant stalks used widely in Southeast Asian cooking and herbal teas.
Cymbopogon citratus · also called West Indian lemongrass, fever grass
Windows are counted from the average date of your last spring frost.
One plant yields a steady supply of fresh stalks through the growing season, and the flavor of freshly cut lemongrass is noticeably brighter than dried or jarred alternatives. In frost-free climates it grows as a permanent, low-maintenance clump.
A little history. Native to South and Southeast Asia, Cymbopogon citratus is a perennial grass that forms dense clumps to 5 feet tall. The aromatic compounds responsible for its lemon scent are concentrated in the swollen stem base, not the leaf blades.
Either works — needs at least 12 inches of soil depth and width; clumps spread to 24 inches, so allow room. In containers: 15-gallon pot or half-barrel; smaller containers restrict stalk size noticeably. Space plants 24 inches (60 cm) apart.
Water deeply 2–3 times per week in warm weather; reduce to once a week in cool spells. Water when the top 2 inches of soil feel dry, or leaf tips begin to curl inward. Aim for about 1–1.5 inches per week including rain.
Side-dress (scatter fertilizer along the base and water in) every 4–6 weeks through the growing season. What to use: high-nitrogen organic fertilizer or balanced compost; lemongrass is a grass and responds strongly to nitrogen.
Cut dead or brown outer leaves back to the base at any time to improve airflow. Do not cut into the pale swollen stem base — that is the harvestable portion.
It's ready when stalks are ready when the base is at least 0.5 inch thick and the lower 4–6 inches are pale, firm, and tightly layered — typically when the clump is 12 inches or more tall. Grip a stalk firmly at the base and twist-pull downward, or cut with a sharp knife as close to the soil as possible. Take outer stalks first, leaving the inner ones to continue growing.
Wrap unwashed stalks in a damp paper towel, seal in a bag, and refrigerate for up to 2 weeks. Freeze whole stalks for up to 6 months.
Not applicable for single-season growing — one established clump produces continuously. In frost-prone areas, start a second pot in midsummer to overwinter indoors as a backup.
In frost-prone areas, cut clump to 6 inches, pot it up, and move indoors to a bright window where temps stay above 45 °F (7 °C). Water sparingly. Replant outside after last frost.
Basil
Gardeners have long grouped these two heat-loving kitchen herbs side by side, since both want full sun, steady moisture, and warm nights above 50F. No pest or growth benefit has been demonstrated, so treat it as a convenient bed plan rather than a working partnership.
Cilantro
Once cilantro bolts (shifts from leaf growth to flowering), its flat flower heads feed hoverflies, lacewings, and tiny parasitic wasps that hunt the aphids clustering at the base of young lemongrass leaves. Let a few plants flower instead of pulling them.
French Marigold
French marigold roots can reduce root-knot nematodes in the soil, but only when the plants are set thickly across the area or turned into the ground at season's end — a few flowers at the bed edge do nothing for a lemongrass clump.
Tomato
Old companion charts pair strongly scented lemongrass with tomatoes as a pest distraction, though no trial supports it. Practically, keep the clump on the north side so its 4-to-5-foot blades do not shade the fruit.
Spearmint
Spearmint spreads by underground runners that thread straight into a lemongrass clump, and once tangled among the stem bases they are almost impossible to pull without wrecking the harvest. Grow mint in its own pot instead.
A perennial — it holds its spot for years, so it sits outside the annual rotation.
As a perennial, lemongrass holds one spot for years and sits outside the annual rotation — no family gap to respect and no replant interval. It feeds moderately and leaves behind clean, fibrous roots; once a clump is dug out, any vegetable family can follow in that ground.
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