It was James Martin, during the masterclass I attended last year, who first whetted my appetite for growing my own lemongrass. Two things were worrying me, though. Firstly, we have cold winters here – it’s usual to get nights down to well below -10C during the winter, and lemongrass is a tropical plant. Secondly, and more prosaically, was where on earth I was going to get hold of a lemongrass plant?
Some months later, with the idea still in the back of my mind, I stumbled across a blog which suggested you could propagate lemongrass successfully from stalks bought for cooking – yep, those rather dry, slightly disappointing bunches of grey-white woody stems from the supermarket. (I regret I didn’t make a note of the blog that inspired me, and I can’t find it now, so can’t give credit.) But the process was very simple. Immerse your lemongrass stalks in a bit of water, in a vase on a bright window sill. Change the water daily, and wait for it to root. Once you’ve got good roots, plant them out. That’s it.
Well, that sounded like a horticultural challenge at my sort of level! And what was to lose, apart from a quid or so for a bunch of lemongrass. (The observant among you will notice there are two different ‘sets’ of lemongrass stems here – the shorter bunch came from the supermarket, whereas the slightly taller ones came from our local Thai market. Neither cost more than a pound.)
The first thing you’ll see, within a few days, is some fresh green growth emerging from the top of your stems. Then, after a week or so, with a bit of luck, root buds will appear. Do change the water for fresh every day (I forgot for a few days and it all got a bit manky, algae-ish and unpromising-looking in there), and try to keep them in a nice bright, warm situation.
Four weeks later, my stems looked like this (I separated the different sets of stems into two separate pint glasses because they looked a bit crowded as the roots started to grow) with primary and secondary roots showing, and lots of new top-growth. With secondary roots present, I felt pretty confident potting up the lemon grass.
I’m surprised – but thrilled – to be able to report that *every single one* of the stems rooted successfully. The Thai market lemongrass rooted a bit faster than the supermarket stuff – I suspect it was rather fresher! – but a week later, that was ready to pot up, too.
I decided to split the stems up and pot them on into three terracotta pots. Keep these well watered especially for the first few days, since the roots are pretty puny and they’re used to having all the water they can drink. I kept them on the same sunny window sill for a couple of weeks, as the nights were still rather cold, but now they’re out on the greenhouse staging.
I’m thrilled to see some brand new stems emerging over the past few days. Of course, I’m anticipating them coming back indoors onto a sunny window sill through the winter – like other warm climate plants like chillies, they don’t appreciate temperatures below 10C, so somehow I can’t see them surviving outside, even in the unheated greenhouse!
All I can say is – propagating lemongrass like this is cheap, it’s simple, and it works – try it! If you enjoy cooking Thai or other East Asian food, or fusion dishes, there’s nothing better than your very own freshly grown and harvested lemon grass! I can’t wait!
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