Lemongrass is one of the easiest plants to propagate at home, and you can do it from a grocery store stalk, an existing clump in your garden, or even seed. The most popular method, rooting stalks in water, requires nothing more than a glass jar and a sunny windowsill. Division of mature clumps is the fastest route to a full-sized plant, and both approaches work reliably in warm climates or indoors. The steps differ depending on your starting material, so here is how each method works in practice.
Rooting Store-Bought Stalks in Water
This is by far the most common way home gardeners get started with lemongrass, and it works because the plant has a strong drive to regenerate from its basal node, the thick, slightly bulbous end where the roots once were. When you buy fresh lemongrass at a grocery store or Asian market, look for stalks that still have the base intact. Avoid any that have been trimmed flat across the bottom or that look dried out and hollow. A firm, pale-green to yellowish base with a visible root nub is ideal.
Peel away any dead or dry outer layers from the bottom couple of inches. Place the stalks in a glass or jar with about two inches of water, making sure the base is submerged but the upper leaves stay dry. Set the jar in a warm spot with bright, indirect light. A kitchen windowsill that gets morning sun works well. Change the water every two days to prevent bacterial buildup, which is the single most common reason stalks rot instead of rooting.
Within five to ten days, you should see small white roots emerging from the base. Some stalks root faster than others, and you may notice new green growth shooting up from the center of the stalk at the same time. Once the roots are about two inches long, the stalk is ready to transplant into soil. You can leave them in water longer without harm, but the sooner you get them into soil after rooting, the less transplant shock they experience.
Transplanting Rooted Stalks Into Soil
Fill a pot at least six inches wide with a loose, well-draining potting mix. Lemongrass does not like sitting in waterlogged soil, so a standard potting mix with some added perlite or coarse sand works well. Make a hole a few inches deep, set the rooted stalk in so the roots are covered and the base sits just below the soil surface, then firm the soil around it gently. Water thoroughly until it drains from the bottom of the pot.
For the first week or two, keep the soil consistently moist but not soggy. Place the pot where it gets at least six hours of direct sunlight. Lemongrass is a tropical grass native to South and Southeast Asia, so it thrives in warmth. Growth will be slow for the first couple of weeks while the roots establish, then you should see new leaves pushing up rapidly. Once the plant is growing actively, you can reduce watering to whenever the top inch of soil feels dry.
Research on lemongrass growth in different soil conditions has shown that adding a balanced mix of organic and inorganic fertilizer supports better establishment. In one study testing various fertilizer combinations in acidic soil, a modest blend of organic and inorganic amendments produced the best growth response.
Rooting Stalks Directly in Soil
If you prefer to skip the water-rooting step entirely, you can plant fresh lemongrass stalks straight into moist soil. This method works best in warm weather when soil temperatures are consistently above 60°F (about 15°C). Prepare the stalks the same way you would for water rooting: peel off any dead layers, make sure the base is intact and firm.
Push the stalk about two inches into moist potting mix, firm the soil around it, and water well. The key difference with this approach is that you need to keep the soil reliably moist for the first two to three weeks, since the stalk has no established roots to draw water. A clear plastic bag loosely placed over the pot can help maintain humidity while the stalk roots, though you should remove it once you see new green growth to prevent mold. Direct soil rooting tends to take a few days longer than water rooting, but the resulting root system often integrates more naturally since it does not need to transition from water-adapted roots to soil.
Dividing Established Clumps
If you already have a lemongrass plant or know someone who does, division is the fastest way to get a productive new plant. Lemongrass grows in dense, expanding clumps, and a single well-established plant can be split into several divisions, each of which will grow into a full-sized clump within one growing season. Propagation through dividing mature clumps is a standard agricultural practice and is used in commercial cultivation as well as home gardens.1Journal of Integrated Science and Technology. Sustainable cultivation and utilization of lemongrass (Cymbopogon spp.): Advances in agronomic practices, pest management, and agro-industrial applications
To divide, dig up the entire clump or tip the pot on its side and slide the root mass out. You will see that the clump is made up of many individual stalks, each with its own set of roots. Using a sharp spade, a serrated knife, or even a sturdy pair of garden shears, separate the clump into sections. Each division should have at least three to five stalks with healthy roots attached. Trim the leaves back to about six inches tall. This reduces water loss while the division re-establishes its root system.
Replant each division at the same depth it was growing before, in a sunny spot with well-drained soil. Water deeply after planting and keep the soil moist for the first couple of weeks. Divisions typically recover quickly because they already have a mature root system. You can expect vigorous new growth within a week or two in warm conditions. The best time to divide is in spring, when the plant is entering its active growth phase, though in tropical climates it can be done almost year-round.
Growing Lemongrass from Seed
Growing lemongrass from seed is possible but much less common than vegetative propagation. Seeds are available from specialty suppliers, and the species most often sold as seed is Cymbopogon citratus, the same culinary lemongrass used in Thai and Vietnamese cooking. The reason most gardeners avoid this method is speed: seed-grown lemongrass takes significantly longer to reach a harvestable size compared to stalks rooted in water or divisions from a mature plant.
If you want to try it, scatter the seeds on the surface of a moist seed-starting mix and press them lightly into the soil. Do not bury them deeply, as they need light to germinate. Cover the tray with a humidity dome or plastic wrap and keep the temperature between 70°F and 75°F (21–24°C). Germination typically takes 10 to 21 days, and the seedlings are thin and grass-like for the first several weeks. They need consistent moisture and bright light during this phase. Thin or transplant seedlings once they are a few inches tall, giving each plant its own pot or spacing them about 24 inches apart in the garden.
Seed-grown plants are genetically variable, which is both a drawback and an occasional advantage. You may notice differences in growth habit, aroma intensity, and vigor between individual seedlings, whereas divisions and stalk-rooted plants are clones of the parent and behave predictably. For most home cooks who just want a reliable supply of lemongrass, stalk rooting or division is the better choice.
Light, Temperature, and Watering for New Plants
Regardless of how you propagate it, lemongrass has the same basic needs once it is growing. Full sun is the single most important factor. In ideal conditions, the plant wants at least six to eight hours of direct sunlight per day. In lower light, it grows leggy and thin, and the aromatic oils in the leaves are less concentrated. If you are growing indoors through winter, a south-facing window is the minimum, and a supplemental grow light helps.
Temperature matters more than most people expect. Lemongrass stops growing below about 50°F (10°C) and can be killed outright by a hard frost. In USDA zones 10 and above, it can stay outdoors year-round. In cooler climates, treat it as a container plant and bring it inside before the first frost. When overwintering indoors, growth slows dramatically, and the plant may look scraggly. That is normal. Cut it back to a few inches tall in early spring, move it back outside when nighttime temperatures are reliably above 50°F, and it will regrow from the base.
Watering should be generous during active growth in summer. Lemongrass is a grass, and like most grasses, it drinks heavily when growing fast. Let the top inch of soil dry between waterings, but do not let the pot go bone-dry. In winter or when the plant is dormant indoors, cut back watering significantly. Waterlogged soil in cool conditions leads to root rot, which is the most common way people lose overwintered lemongrass.
Common Problems When Propagating
The most frequent failure with water-rooted stalks is rot. If the stalk turns slimy and brown at the base within the first few days, the culprit is almost always bacterial growth in stagnant water. Change the water every day or two, and make sure you are using stalks that were fresh when you bought them. Stalks that have been sitting in a refrigerator for weeks are less likely to root successfully because the basal tissue has already started to break down.
Another common issue is stalks that produce roots but never send up new green growth. This usually means the growing point at the center of the stalk was damaged or dried out. If you peel back the outer layers and find the core is brown or hollow, that stalk will not produce a viable plant. Toss it and start with a fresh one.
For divisions, the main risk is planting in soil that stays too wet. Lemongrass roots are fibrous and can handle dry periods better than standing water. If a division wilts despite wet soil, the roots are probably rotting. Pull it up, trim off any mushy brown roots, let the cut ends dry for a few hours, and replant in fresh, dry-side soil. Pests are generally not a major concern during propagation, though spider mites can appear on plants grown indoors in dry air. A strong spray of water on the leaves usually handles minor infestations.
Growing in Containers
Lemongrass is an excellent container plant, and for anyone in a climate with cold winters, containers are really the only practical option unless you treat it as an annual. A single lemongrass plant can fill a five-gallon pot within one season, so start with a container at least 12 inches in diameter. Use a loose, well-draining potting mix, and make sure the pot has drainage holes. Lemongrass in containers dries out faster than in-ground plants, so expect to water more frequently during summer, sometimes daily in hot weather.
One advantage of container growing is that you can move the plant to follow the sun. If your yard or balcony only gets direct sun for part of the day, shifting the pot to the sunniest spot makes a real difference in growth rate and flavor intensity. Feed container lemongrass with a balanced liquid fertilizer every two to three weeks during the growing season. In the ground, lemongrass can scavenge nutrients from a larger soil volume, but in a pot it depends entirely on what you provide.
When the plant outgrows its container, either divide it and repot the divisions into separate containers, or move it up to a larger pot. You will know it is time when roots start circling the bottom of the pot or growing out of the drainage holes. Pot-bound lemongrass does not die, but it grows more slowly and produces thinner stalks.
Harvesting Without Killing the Plant
One of the nice things about lemongrass is that harvesting is itself a form of management that keeps the plant productive. To harvest a stalk, grip it near the base and twist it firmly while pulling. It should snap free from the clump cleanly. Alternatively, cut individual stalks at soil level with a sharp knife. Always leave at least a third of the stalks in place so the plant can continue photosynthesizing and regrowing.
The edible part used in cooking is the lower four to six inches of the stalk, the pale, dense section closest to the root. The upper leaves are too fibrous to eat but make excellent tea or can be dried and used in soups and broths for flavor. Regular harvesting encourages the plant to produce new tillers from the base, which keeps the clump dense and productive rather than letting it go woody in the center.
If you are growing lemongrass for its essential oil rather than for cooking, harvest timing matters. Oil content in lemongrass varies depending on the cultivar and growing conditions, with averages reported between roughly 0.3% and 0.6% on a fresh weight basis.1Journal of Integrated Science and Technology. Sustainable cultivation and utilization of lemongrass (Cymbopogon spp.): Advances in agronomic practices, pest management, and agro-industrial applications Leaves harvested later in the season, when the plant is mature and actively growing, tend to have more oil than young regrowth.
Why Flavor Varies Between Plants
If you have propagated lemongrass from different sources, you may have noticed that some plants smell and taste more intensely lemony than others. This is not your imagination. The primary aromatic compound in lemongrass is citral, and its concentration varies between cultivars and even between individual plants of the same species. Selective breeding has shown this clearly: in a study that ran five cycles of selection for higher essential oil content in East Indian lemongrass, the average oil percentage more than doubled, climbing from about 0.66% to 1.67%. However, the final two cycles of selection for oil content led to a drop in citral concentration in that oil, meaning more oil did not automatically mean more lemony aroma.2Wiley Online Library. Five cycles of recurrent selection for increased essential oil content in East Indian lemongrass: response to selection, and effects on heritabilities of traits and intertrait correlations
For home propagation, the practical takeaway is simple: if you find a plant or stalk that tastes and smells great, propagate from that specific plant. Since stalk rooting and division produce genetic clones, every new plant will carry the same aromatic profile as the parent. Growing from seed introduces genetic variability, so you lose that consistency. This is a genuine reason to prefer vegetative propagation over seed, beyond just the speed advantage.
Tissue Culture and Large-Scale Propagation
Home gardeners will never need tissue culture, but it is worth knowing that commercial producers and research programs use it to propagate lemongrass at scale. Two main laboratory approaches exist for mass-producing lemongrass plants. One uses temporary immersion systems to grow shoots from small pieces of plant tissue, and the other uses a process where embryo-like structures form from callus tissue and develop into complete plants. Both methods can produce large numbers of genetically identical plants more quickly than field division allows.3PubMed. In Vitro Mass Propagation of Cymbopogon citratus Stapf., a Medicinal Gramineae
The somatic embryogenesis approach has been demonstrated specifically with Cymbopogon flexuosus, the East Indian lemongrass species grown primarily for its essential oil. Researchers developed a method for long-term, high-frequency plant production using this technique, which allows consistent propagation of high-oil-yield lines without the genetic drift that can occur over many generations of field division.4PubMed. Rapid propagation of lemongrass (Cymbopogon flexuosus (Nees) Wats.) through somatic embryogenesis in vitro
These techniques require sterile lab conditions, specialized growth media, and plant growth hormones, so they are firmly in the domain of commercial nurseries and agricultural research stations. But they explain how garden centers and herb farms can offer large quantities of uniform lemongrass plants at reasonable prices. When you buy a potted lemongrass plant from a nursery, there is a decent chance it started life in a tissue culture lab rather than from a stalk in a jar on someone’s windowsill.
Lemongrass as a Companion Plant
Once you have successfully propagated your lemongrass, where you place it in the garden matters beyond just sun exposure. Lemongrass has a strong citronella-like scent that many gardeners believe repels mosquitoes and other insects. The evidence for mosquito repulsion from a living plant is weaker than the marketing suggests, since the volatile oils need to be released from crushed or broken leaves to have much effect on nearby insects. Simply standing next to an intact lemongrass plant does not create a meaningful mosquito-free zone.
That said, lemongrass can function well as a companion plant for other reasons. Its dense, clumping growth habit makes it an effective living border or windbreak for smaller herbs and vegetables. Some gardeners report that planting it near tomatoes or peppers helps with whitefly pressure, though controlled studies on this are thin. Be aware that lemongrass is a vigorous grower and can crowd out smaller neighbors if not managed. In-ground plants spread by tillering and can form clumps several feet across within a couple of seasons. If you want to contain it, growing in a pot sunk into the ground, with the rim a couple of inches above soil level, works as a physical barrier to spreading.