Regrow Vegetables From Scraps: Hara Pyaz, Lehsun, Aloo and Myths
Not every scrap regrows, whatever the reels say. Spring onion roots, garlic cloves, sprouting potatoes, lemongrass and pudina stems genuinely grow again; lettuce and cabbage bases give one small flush and give up; and a carrot top will never grow you a carrot. Here’s how to regrow vegetables from scraps honestly: which ones are worth it, how to do the water-glass method without breeding mould or mosquitoes, and how to take garlic and aloo all the way in a pot.
The short version
- Regrow fully: hara pyaz roots, lehsun cloves, aloo eyes, lemongrass, pudina, adrak and haldi
- One weak flush: lettuce, cabbage, celery and bok choy bases
- Myth: carrot, mooli, beetroot and shalgam tops (leaves only, no root)
- Water rule: change it every day; cloudy, slimy or smelly means bin it
Prefer to listen? This post as a 5 min video · Video page with transcript
Which vegetables can you regrow from scraps?
The trick is simple. A scrap regrows only if it still has a growing point: a root plate, a bud, an eye or a node. Leaves alone don’t. A cut root alone doesn’t either.
| Scrap | What you get | Verdict |
|---|---|---|
| Hara pyaz (spring onion) roots | New green tops in a week | Yes, 2 or 3 cuts in water, more in soil |
| Lehsun (garlic) clove | Green garlic leaves, then a bulb in soil | Yes, full crop in a pot |
| Aloo (potato) with eyes | A whole new plant and new potatoes | Yes, in a deep bag or bucket |
| Lemongrass stalk | Roots, then a clump | Yes |
| Pudina (mint) stems | Roots in about 10 days | Yes, very easy |
| Lettuce, cabbage, celery base | A few small leaves | One weak flush, no new head |
| Carrot, mooli, beetroot top | Feathery or leafy tops | No new root, ever |
Adrak and haldi regrow beautifully too, but they’re a 10-month project with their own needs; see our guide to growing ginger and haldi in a pot.
The water-glass method, done safely
A glass of water on the windowsill is the easiest start. It’s also how people end up with a jar of slime.
- Cut the scrap so 3 to 5 cm of the base stays on, with roots or root plate intact.
- Stand it in a short glass or jar with only 1 to 2 cm of water. The base sits in water; the cut top stays dry.
- Put it somewhere bright, like a kitchen window, but out of harsh afternoon sun, which heats the water.
- Change the water every day. Rinse the glass and the roots under the tap while you’re at it.
- Snip green growth with clean scissors when it’s 10 to 15 cm tall, leaving 2 to 3 cm to regrow.
- After 2 or 3 cuts, move the scrap to a pot of soil if you want it to keep going. Water holds no food.
When to bin it: water that turns cloudy within a day, a slimy or mushy base, black or fuzzy mould, or a rotten smell. Those greens aren’t worth eating. Throw the scrap in the compost, scrub the glass, and start again with a fresh one.
The daily change matters for another reason. Still water left for a week is exactly where dengue mosquitoes lay eggs. Fresh water every day and they never get the chance.
How to regrow the ones that really work
Hara pyaz (spring onions)
The fastest win. Keep the white root end, about 4 cm, when you cook a bunch. In water, new green shoots appear in 2 to 3 days and are ready to cut in about a week. Plant the bases 2 to 3 cm deep in a pot and they’ll keep giving for months. For using, storing and the difference between hara pyaz and lehsun patta, see our spring onion and green garlic guide.
Lehsun (garlic): can garlic be grown in a pot?
Yes, and it’s one of the best scrap crops. A clove in water gives you green shoots but never a bulb. For bulbs, use soil.
- When: October to November in the plains. Garlic needs the cold of winter to form a bulb.
- Pot: at least 20 to 25 cm deep, with drainage holes.
- How: separate the biggest, firmest cloves (skin on), and push them in pointy end up, 5 cm deep and 10 to 12 cm apart.
- Green garlic: snip a few leaves from 4 to 6 weeks for lehsun patta, never more than a third of each plant.
- Bulbs: ready around March to April, when about half the leaves have turned yellow. Stop watering a week before you dig.
Pot-grown bulbs are usually smaller than market ones. Desi garlic with small, strong cloves tends to do better than big imported cloves.
Aloo (potatoes)
A potato that has sprouted in the basket is asking to be planted. Cut it into chunks, each with 2 eyes, and let them dry a day. Plant 10 cm deep in a grow bag or bucket of at least 30 to 40 litres, in October or November in the plains. As the stems grow, keep adding soil around them so new potatoes form under cover. Harvest after 90 to 120 days, once the leaves yellow and die down. A bag gives a modest bowlful, not a sack.
Potato plants carry a warning. The leaves, stems, small green berries and any green-skinned potatoes contain solanine, a natural toxin. Never eat them, keep children and pets away from the plant, and cover any tuber that peeks out of the soil so it doesn’t turn green.
Lemongrass and pudina
A lemongrass stalk bought with its base intact roots in water in 1 to 3 weeks; pot it when the roots are 3 to 5 cm long (our lemongrass guide has the growing and tea side). Pudina is even easier. Take 10 to 15 cm stems from a fresh bunch, strip the lower leaves, and stand them in water. Roots show in 7 to 10 days.
Hara dhania is the odd one out: it doesn’t regrow from stems. Grow it from split sabut dhania seed instead, as in our hara dhania guide.
Myth: a carrot top will grow you a new carrot
It won’t. The carrot you eat is a swollen taproot, and once it’s cut off, the plant has no way of making another one. A carrot top in water grows pretty feathery leaves, and that’s all. The same goes for mooli, beetroot and shalgam tops. Enjoy them as a green windowsill decoration, or eat the carrot leaves chopped into a chutney (they’re edible, if a little bitter), but don’t expect a root.
People believe it because the leaves grow so eagerly. Healthy leaves look like progress. There’s simply nothing below them to fill out.
Myth: lettuce and cabbage grow a new head in water
A lettuce or cabbage base in water sends up a few small, loose leaves over 1 to 2 weeks. They’re edible if fresh. Then the plant either rots or shoots up a bitter flower stalk. You get a garnish, not a head.
Myth: spring onions regrow forever in water
Each cut is thinner and paler than the last, because water has no nutrients. After 2 or 3 rounds, plant them in soil or compost them.
Change water daily, and never eat greens from a glass that smells or looks slimy. Wash regrown greens under running water before eating. Potato leaves, stems, berries and green potatoes are toxic, so keep them away from children and animals, and cut off sprouts and green patches from any potato you cook. Wash your hands with soap after handling soil, and wear gloves if you have a cut. Don’t leave water-filled glasses or saucers standing for days: they breed mosquitoes, including the ones that spread dengue.
Regrowing is one of the gentlest ways to squeeze more from what you’ve already bought. More ideas live in our Zero-Waste Kitchen section.
Regrowing vegetables: your questions
What vegetables can you regrow from scraps?
The reliable ones are spring onion roots, garlic cloves, potatoes with eyes, lemongrass, pudina, ginger and haldi. Lettuce, cabbage and celery bases give only a few leaves. Carrot and mooli tops give leaves but never a new root.
How do I regrow vegetables in water?
Stand the base in 1 to 2 cm of water in a bright spot, and change the water every day. Cut the new growth with clean scissors, and move the scrap to soil after 2 or 3 cuts.
Can garlic be grown in a pot?
Yes. Plant single cloves 5 cm deep and 10 to 12 cm apart in a pot at least 20 cm deep, in October or November. Pick some leaves as green garlic and dig bulbs in March or April.
Why is my garlic sprouting in the kitchen?
Garlic wakes up after a few months of storage, especially somewhere warm. Sprouted cloves are safe to eat, though the green centre is bitter. They’re also perfect for planting.
Can I eat regrown spring onions?
Yes, if the water was changed daily and the roots look clean and white. Rinse them first. If the glass smelled or the base went slimy, throw them away.
How long do spring onions take to regrow?
New shoots appear in 2 to 3 days and are ready to cut in about a week. Each later cut is a little thinner.
Can I plant a potato that has sprouted?
Yes. Cut it into pieces with 2 eyes each, let them dry for a day, and plant 10 cm deep in a deep bag or bucket. Don’t eat the plant’s leaves or berries.
Can you regrow carrots from carrot tops?
No. A carrot top grows leaves, never a new carrot, because the root it came from is gone. You’d need carrot seed to grow carrots.
Why does the water in my regrowing glass smell?
Bacteria are breaking down dead roots or a rotting base. Throw out the scrap and water, scrub the glass, and change the water daily next time.
Why are my garlic leaves turning yellow?
In spring, yellowing leaves are the signal that bulbs are nearly ready. Earlier in winter, it usually means soggy soil or a hungry pot, so check drainage and add a little compost.