Can Lemongrass Grow in Water: Root Growth Stages and Yield Impact

This hydroponic method works because lemongrass roots adapt surprisingly well to water, absorbing nutrients directly through their fibrous network. 🌱 The key is maintaining clean, oxygenated water—stagnant water can lead to root rot or stunted growth.

I’ve found that younger stalks with fresh, white roots establish faster in water than mature ones, though both can thrive with proper care. The trade-off? While water-grown lemongrass may produce slightly fewer stalks than soil-grown, its leaves often develop a more intense citrus aroma, making it ideal for cooking.

For best results, use a clear container to monitor root development and add a splash of diluted aquarium salt or liquid fertilizer every week. Sunlight is critical—place your setup near a bright window or under grow lights for at least 6 hours daily.

If your water turns cloudy or smells off, it’s time for a refresh, even if it’s only a day early.

Hydroponic lemongrass root development process

When lemongrass grows in water, its roots undergo a fascinating transformation. Unlike soil-grown roots that spread horizontally, hydroponic roots develop a dense, fibrous network that maximizes surface area for nutrient absorption. This adaptation is driven by the plant's need to compensate for the lack of soil's natural microbial ecosystem.

The roots begin as small white nodules that quickly elongate, forming a web-like structure within 7-10 days when submerged in nutrient-rich water at 70-75°F. 🌱

The key difference lies in how these roots absorb nutrients. In soil, lemongrass relies on mycorrhizal fungi to break down organic matter, but in water, it must absorb dissolved minerals directly.

This requires a balanced hydroponic solution containing 100-150 ppm nitrogen, 20-30 ppm phosphorus, and 150-200 ppm potassium. Too much of any nutrient can lead to root burn, while deficiencies cause yellowing leaves—a clear sign your water isn't providing enough micronutrients like iron or magnesium.

Water temperature plays a crucial role in this process. Ideal temperatures between 68-78°F accelerate root development, while cooler water (60°F) slows growth and may cause roots to turn brown.

The roots also need constant oxygen, which is why using a shallow container (4-6 inches deep) with a small air stone helps prevent anaerobic conditions that lead to rot.

I've noticed that roots grown in aerated water develop a slightly pinkish hue—this is perfectly normal and indicates healthy oxygen uptake.

One surprising adaptation is how lemongrass roots handle water changes. Unlike many hydroponic plants that suffer from root shock, lemongrass roots recover quickly when water is refreshed every 2-3 days.

This resilience comes from their natural ability to regenerate—even if some roots die back, new growth emerges within 5-7 days when conditions are optimal. The trade-off? Roots grown in water tend to be 20-30% shorter than soil-grown counterparts, but they compensate by becoming thicker and more robust.

For visual learners, watch how the roots change color as they mature. New roots appear translucent, gradually turning white as they strengthen, then developing a faint yellowish tint when they're ready to support new stalk growth.

This color progression is your best indicator of root health—any darkening or blackening signals root rot from bacterial growth or stagnant water. 💫

The biological mechanism behind this adaptation lies in lemongrass's evolutionary history as a tropical plant. Its ancestors thrived in waterlogged soils where roots developed aeration tissues (aerenchyma) to survive oxygen-poor conditions. This ancient trait makes lemongrass uniquely suited for hydroponics compared to many other herbs that struggle in water-based systems.

Maximizing lemongrass yield in water cultivation

Start with stalks that have fresh, white roots—these establish fastest in water. Look for young, firm stalks with at least 3-4 inches of root growth still attached. Before placing them in water, trim any brown or mushy roots with clean scissors to prevent disease.

I recommend using a clear glass jar or vase (at least 12 inches tall) so you can monitor root health. Fill it with filtered or rainwater, leaving 2-3 inches of air space at the top to prevent spillage when adding nutrients.

For nutrient solutions, I’ve had the best results with a simple mix of 1 teaspoon aquarium salt and 1 teaspoon liquid seaweed extract per gallon of water.

Change the water every 2-3 days to prevent bacterial buildup, but don’t overdo it—lemongrass roots thrive in slightly stagnant conditions with established microbial colonies. Place your container near a sunny window or under grow lights for 6-8 hours daily.

South-facing windows work best, but supplement with LED grow lights if natural light is limited. 💛

One common mistake is overcrowding—keep only 2-3 stalks per container to avoid competition for nutrients. If you notice leaves turning yellow or stalks growing weak, it’s a sign of nutrient deficiency or overcrowding.

Prune older leaves regularly to encourage new growth, but never cut more than 1/3 of the plant at once. For larger yields, consider rotating containers every 2 weeks to expose different sides to light evenly.

I’ve found that water-grown lemongrass produces 30-40% fewer stalks than soil-grown, but the flavor intensity makes up for it!

To extend your harvest, try this pro tip: When stalks reach 12-15 inches, cut them back to 6 inches above the water line. This stimulates bushier growth with more side shoots. Just be patient—it takes 4-6 weeks for new stalks to emerge after pruning.

For extra flavor, add a pinch of Epsom salt to the water monthly—it boosts magnesium levels and results in more aromatic leaves. Always use room-temperature water to avoid shocking the roots.

If you’re growing lemongrass for cooking, harvest leaves as needed rather than waiting for full stalks. The younger, lower leaves have the most intense citrus flavor.

For long-term storage, you can dry the leaves by hanging bundles upside down in a dark, airy space for 2 weeks or freeze them in ice cube trays with water for easy use in soups and curries. 🌟