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Tips on how to grow lemongrass from supermarket shoots. Includes tips on rooting the shoots, planting them, and aftercare.
Lemongrass is one of my favorite tasting herbs and one that I never thought I would grow at home. I use it when cooking Thai dishes and it’s just divine in Tom Yum Soup served with a side of jasmine rice. Its lemony-ginger taste is also delicious as a refreshing tea, a cup of which I’m enjoying at the moment. It has a reputation as imported food, but if you give it the right conditions, it’s possible to grow your own lemongrass at home.
Lemongrass is commonly grown from seed but you can buy a packet of them from some seed suppliers. However the seeds are quite small and fiddly and the germination rate can take up to 40 days, which is a lot of time for most people to keep a small tray of soil moist and at the correct temperature.
How to Grow Lemongrass
The easiest way to grow lemongrass at home is from shoots, either purchased in a garden center or in the supermarket. When I say a supermarket, I mean the lemongrass that’s sold for consumption as opposed to growing as plants. Lemongrass found in the supermarket isn’t very expensive and if it’s not wilted or too brown/dried-out, it’s possible to grow a new Lemongrass plant from each stalk!
To get started, go shopping and buy the firmest, least dried-out bunch of lemongrass you can find. Take it home and then peel back the first layer or two and a good part of the upper leaves, especially the ones which are dried out.
Then fill a glass with plain water, put the trimmed lemongrass stalks in and place the whole thing into a warm window sill. The water should completely cover the bulbous bit at the bottom of the stalks. Within a few weeks, roots will start to appear and possibly some leaves. When the roots are about 1-2 inches long, you can trim back the original stalk a bit more and then plant each stalk into its own small pot of compost.
Planting Lemongrass Shoots
Gently cover all the roots and quite a bit of the bulbous part at the bottom if you can. One of my stalks sprouted some baby leaves though so with that one I just made sure to cover the roots and a bit of the bottom of the bulb. As soon as the leaves are bigger, I’ll add more compost to the pot.
These small pots of lemongrass should be grown in a warm place until they have plenty of leaves and the roots need a bigger pot. At this point, you can harden them off over a week and then plant outside in a sunny, warm, and moist spot 12 inches apart. You can also re-pot them into larger containers to keep indoors or in a greenhouse. Fully grown, the plant is fairly bushy with long thin leaves and numerous stalks emerging from the original one. Though they can grow to large sizes if they have the space, a container or pot will constrict their roots enough to make it a lovely house plant.
To harvest, just select the stalks you want and simply break them off the main plant at the base. The bulb is the bit you mainly use in cooking and it is actually the only part you can eat. The leafy bits can be used as well but you’ll need to pick these out at the end of the cooking time. Better yet, pop them into the freezer and use them when you want to have a nice cup of tea.
Lemongrass needs can’t survive below 7°C/45°F so if you plant it outside, make sure to lift them in the autumn. Bring lemongrass plants into a greenhouse or the house for the winter and plant it back outside once it’s warm enough.