No Soil? No Problem! Grow Lemongrass in Bottled Water

Whether you’re limited by space or simply want a cleaner, mess-free method of growing herbs, hydroponic-style lemongrass propagation is one of the easiest ways to start. Here’s how to do it from start to harvest.

Why Lemongrass?

Lemongrass (Cymbopogon citratus) is a tropical herb widely used in Asian cooking, herbal teas, and natural remedies. It offers anti-inflammatory and antibacterial benefits and brings a fragrant zest to soups, marinades, and stir-fries.

Fresh lemongrass is more flavorful than dried, and growing it at home ensures a continuous supply without frequent grocery runs.

What You’ll Need

• • Lemongrass stalks (from the store or garden)

  • Clear plastic bottles (1.5L to 2L water bottles work best)

• Clean water

• Sharp scissors or knife

• A sunny spot (windowsill or balcony)

• Optional: Activated charcoal or small aquarium stones

Step 1: Choose and Prepare Lemongrass Stalks

Pick firm, healthy-looking stalks with intact bases. Even if the tops are trimmed, what’s important is that the bottom bulb is still present and slightly moist.

Rinse the stalks to remove any residue or dirt. Trim the tops, leaving about 6–8 inches (15–20 cm) of stalk.

Step 2: Prepare the Bottle Planter

Take a clean plastic bottle and cut it around the top third. Invert the top like a funnel and place it into the bottom portion, or simply use the bottle as a tall water vase.

Fill it with clean water about halfway. For added freshness and to prevent bacterial growth, drop in a small piece of activated charcoal or a few rinsed aquarium pebbles.

Insert the lemongrass stalks bulb-side down. Make sure the root end is submerged but not the entire stalk, to avoid rot.

Step 3: Place in a Sunny Spot

Lemongrass loves warmth and light. Place your bottle near a sunny window, balcony rail, or any spot that gets at least 6 hours of sunlight daily.

If you’re indoors and sunlight is limited, a small grow light can help support healthy growth.

Step 4: Water Maintenance

Change the water every 3 to 4 days to keep it fresh and oxygenated. Rinse the stalks each time to remove any buildup. Within 5–10 days, you should start to see roots forming from the base.

Once roots reach about 1–2 inches long, your lemongrass is considered established and will begin to push out green shoots from the center.

Step 5: Encourage Growth

After 2–3 weeks, the shoots will grow taller and the base may thicken. Trim old leaves or brown outer layers to promote healthier new growth. Lemongrass doesn’t require fertilizer in water if you refresh it regularly, but you can use a tiny amount of diluted hydroponic nutrient solution if you want to boost performance.

Keep an eye out for any slimy build-up or yellowing leaves—these are signs of poor water hygiene or too little light.

Step 6: Harvesting Your Lemongrass

Once your lemongrass plant has strong roots and tall shoots (usually within 30–45 days), you can start harvesting.

To harvest:

• Use clean scissors to snip off the green tops for tea or soup.

• For cooking, remove an entire stalk by gently pulling it upward. Let the remaining stalks continue growing.

You can rotate harvests by staggering stalk development—keep a few in water and start new ones every couple of weeks for a continuous supply.

Step 7: Optional Soil Transition

While lemongrass can live in water indefinitely if well-maintained, you can also transplant it into soil once it forms a good root system. Just plant it in well-draining potting mix in a deep pot and keep it in a sunny location.

This hybrid method gives you the benefits of water-rooting ease and soil-based long-term growth.

Pest and Mold Prevention

Growing in water reduces the risk of soil pests, but algae and mold can still appear if water is stagnant or containers are dirty. Always:

• Clean bottles thoroughly every few weeks

• Keep bottles out of standing water trays

• Avoid overexposing the water to direct sunlight (which promotes algae)

Eco-Friendly Bonus

Using recycled bottles is not only cost-effective but also a great way to reduce plastic waste. You can even get creative—hang them vertically, set up a window garden, or arrange them in rows across a shelf.

This method also works great in schools, apartments, or even offices where soil gardening isn’t practical.

Final Thoughts

Lemongrass in water is one of the easiest indoor herb gardening projects for beginners. It’s low-maintenance, space-saving, and instantly satisfying once those first roots appear.

Whether you’re growing it for the kitchen or just to green up your windowsill, this hydroponic-style setup is proof that you don’t need soil—or much space—to enjoy fresh, fragrant herbs at home.