How Fast Does Lemongrass Grow – From Seedling To Harvest In One Season
Lemongrass is an exceptionally fast-growing tropical grass that can reach a height of 3 to 5 feet and a width of 2 feet within a single growing season. In ideal conditions, you can begin harvesting individual stalks just 90 to 100 days after planting.
To achieve this rapid growth, the plant requires full sun, consistent moisture, and nitrogen-rich soil. While it is a perennial in USDA zones 9-11, many gardeners in cooler climates grow it as a vigorous annual.
You want to add a touch of the tropics to your garden while securing a fresh supply of citrusy herbs for your kitchen. We all agree that waiting years for a plant to mature can be frustrating when you have a specific landscape design or recipe in mind.
I promise that by understanding the specific environmental triggers of this plant, you can maximize its development and see massive gains in just a few months. This guide will provide a clear timeline of what to expect and the professional secrets to accelerating its growth.
We will cover the ideal soil conditions, the impact of temperature, and the specific maintenance routines I use to keep my clients’ lemongrass thriving. You will also learn how to troubleshoot common growth-stunting issues before they ruin your harvest. Many gardeners ask, how fast does lemongrass grow before they commit to a planting spot, so let’s dive into the details.
The General Timeline of Lemongrass Development
Lemongrass (Cymbopogon citratus) does not follow the slow, steady pace of many woody perennials. Instead, it behaves more like a high-octane ornamental grass that explodes with life as soon as the mercury rises.
During the first month after planting a division or a rooted cutting, the plant focuses on establishing its root system. You might see only a few inches of top growth, but beneath the soil, the rhizomes are stretching out to secure nutrients.
By the second month, the growth shifts gears. You will notice new “pups” or side shoots emerging from the base of the original stalk, significantly increasing the clump’s diameter.
In the third and fourth months, the plant enters its peak vegetative state. If the weather remains hot and the soil stays moist, the leaves can grow several inches in a single week, quickly reaching their mature height.
how fast does lemongrass grow
When we look at the specific metrics, how fast does lemongrass grow depends heavily on the starting material and the local climate. A stalk rooted in water and then moved to the garden will usually outpace a plant started from seed by several weeks.
In a standard 90-day window, a healthy lemongrass plant will typically grow from a 6-inch starter to a 3-foot-tall fountain of green foliage. This rapid expansion makes it an excellent choice for creating a temporary privacy screen or a “thriller” element in large patio containers.
If you live in a region with long, humid summers, such as the Southeast United States, the growth rate can be even more aggressive. I have seen well-fed clumps reach 5 feet in height and 4 feet in width by late September.
In cooler northern climates, the growth is more measured. However, even in Zone 5 or 6, a lemongrass plant started indoors in April and moved outside in June can provide a substantial harvest before the first frost in October.
Key Factors That Accelerate Growth
To get the most out of your lemongrass, you need to mimic its native Southeast Asian habitat. This means prioritizing heat, light, and a specific balance of nutrients that support leafy development.
The Power of Full Sun
Lemongrass is a sun-worshiper that requires at least 6 to 8 hours of direct sunlight daily. Photosynthesis is the engine that drives its speed; without enough light, the stalks become spindly and the growth rate plummets.
If you plant lemongrass in partial shade, it will survive, but it won’t “bulk up” the way you want. For the fastest results, place it in the hottest, brightest part of your garden, perhaps near a south-facing wall that radiates heat.
Optimizing Soil and Nutrition
This plant is a heavy feeder. To sustain such rapid vertical growth, it requires soil that is rich in organic matter and has a high nitrogen content.
I recommend amending your soil with well-rotted compost or aged manure before planting. For a boost, use a balanced water-soluble fertilizer or a high-nitrogen formula (like a 20-10-10 NPK ratio) every two to three weeks during the peak growing season.
Keep in mind that while it loves nutrients, it needs well-draining soil. Standing water can lead to root rot, which will instantly stop growth and eventually kill the plant.
Consistent Moisture Levels
Because lemongrass grows so quickly, it transpires a lot of water through its long, blade-like leaves. Dry soil acts as a brake on its development, signaling the plant to conserve energy rather than expand.
Check the soil moisture daily during the heat of summer. The goal is to keep the soil consistently moist, similar to a wrung-out sponge, without letting it become waterlogged or bone-dry.
Planting Methods: Seeds vs. Cuttings
The method you choose to start your lemongrass will significantly impact your harvest timeline. Most professional landscapers and experienced DIYers prefer propagation over seeds for a head start.
Propagating from Grocery Store Stalks
This is the “pro secret” for the fastest results. You can buy fresh lemongrass stalks from an Asian grocery store, trim the tops, and place the base in a jar of clean water.
Within a week or two, you will see white roots emerging from the bottom. Once these roots are an inch long, you can transplant them directly into the soil, essentially skipping the month-long “infant” stage of seed growth.
Starting from Seed
Growing from seed is possible but much slower. Lemongrass seeds require warm temperatures (70-75°F) to germinate and can take up to 21 days just to sprout.
If you choose this route, you must start them indoors 8 to 10 weeks before the last frost. Even then, your plants will likely be smaller at the end of the season compared to those grown from divisions or cuttings.
Safety First: Handling Your Lemongrass
As a gardening specialist, I always emphasize safety when dealing with ornamental or culinary grasses. Lemongrass leaves have microscopic serrations along the edges that can be quite sharp.
Always wear protective gloves and long sleeves when pruning or harvesting a large clump. These “grass cuts” are similar to paper cuts but can be more irritating due to the plant’s essential oils.
When using tools like pruning shears or a garden knife to harvest stalks, ensure they are sharpened and sanitized. A clean cut promotes faster healing for the plant and prevents the introduction of pathogens.
Maintaining Momentum: Pruning and Mulching
Once your lemongrass is established, you can’t just leave it to its own devices if you want peak performance. Active management keeps the plant’s energy focused on new, tender growth.
Apply a 2-inch layer of organic mulch, such as wood chips or straw, around the base of the plant. This helps regulate soil temperature and retains moisture, both of which are critical for maintaining a steady growth rate.
Understanding how fast does lemongrass grow helps you plan your landscape layout, ensuring you leave enough space for its mature spread. If the clump becomes too dense, the inner stalks may start to die back due to a lack of light and airflow.
Don’t be afraid to harvest frequently. Removing the outer, older stalks encourages the plant to produce new shoots from the center, keeping the clump productive and preventing it from becoming overly “woody” or tough.
Common Pitfalls That Stunt Growth
If your lemongrass seems to be standing still, there is usually an environmental culprit. Identifying these early can save your season.
Temperature Fluctuations
Lemongrass is extremely sensitive to cold. If temperatures drop below 50°F (10°C), the plant will enter a semi-dormant state, and growth will stall. If a surprise late-spring frost hits, it can kill the foliage entirely.
Always wait until the soil is consistently warm before moving your plants outdoors. In my experience, waiting an extra week for the weather to stabilize often leads to faster overall growth than rushing them out into the cold.
Pests and Diseases
While relatively hardy, lemongrass can fall victim to spider mites or aphids, especially in dry conditions. These pests suck the sap from the leaves, depriving the plant of the energy it needs to grow.
Another issue to watch for is lemongrass rust (Puccinia nakanishikii), a fungus that appears as brown or orange streaks on the leaves. If you see this, remove the affected leaves immediately and improve the airflow around the plant.
When you monitor how fast does lemongrass grow, you can adjust your fertilizer schedule to compensate for any minor setbacks caused by pests. A healthy, vigorous plant is much better at resisting infestations than a stressed one.
Winter Care and Overwintering for Faster Spring Growth
If you live outside of Zone 9, your lemongrass will not survive a hard freeze. However, you don’t have to start from scratch every year.
In late autumn, you can dig up a portion of the clump, trim the leaves back to about 6 inches, and pot it up to keep indoors near a sunny window. By keeping the plant alive over winter, you start the next spring with a mature root system.
This “head start” means that as soon as you replant it in May or June, it will explode with growth much faster than any new cutting could. This is the best way to ensure you have massive, 5-foot stalks by mid-summer.
Frequently Asked Questions
Can I grow lemongrass in a pot?
Yes, lemongrass thrives in containers. Choose a pot that is at least 12 inches deep and 12 inches wide with excellent drainage. Because pots dry out faster, you will need to water more frequently to maintain a high growth rate.
Why are the tips of my lemongrass leaves turning brown?
Brown tips usually indicate underwatering or low humidity. It can also be a sign of salt buildup from synthetic fertilizers. Try increasing your watering frequency and flushing the soil with plain water occasionally.
How do I know when the stalks are ready to harvest?
Stalks are ready when they are at least half an inch thick at the base. Simply cut the stalk at ground level or give it a firm tug to pull it away from the main rhizome. The younger stalks are generally more tender for cooking.
Does lemongrass keep mosquitoes away?
While lemongrass contains citronella oil, the living plant itself does not release enough of it to act as an effective mosquito repellent. You would need to crush the leaves to release the oils, though the plant still makes a beautiful and fragrant addition to a “pest-deterrent” garden layout.
Conclusion
Watching a lemongrass plant transform from a simple stalk into a towering, aromatic masterpiece is one of the most rewarding experiences for a DIY gardener. Its rapid pace makes it an ideal candidate for those who want quick results and a functional harvest within a single season.
By prioritizing full sun, rich nitrogen-based nutrition, and consistent moisture, you can ensure your garden reaches its full potential. Remember to handle the sharp leaves with care and consider overwintering your plants to get an even faster start next year.
Now that you know the secrets to its speed, it’s time to get your hands in the soil. Start your cuttings today, and you’ll be harvesting fresh, homegrown lemongrass for your favorite soups and teas before the summer is over!
- How To Plant Boxwood Hedge – For A Dense, Timeless Landscape Border - September 17, 2026
- How To Plant Boxwood – For Thriving, Low-Maintenance Hedges - September 17, 2026
- How To Grow A Boxwood Hedge – For Dense, Year-Round Greenery - September 17, 2026