As someone who’s lived in a city their whole life, growing your own herbs and vegetables in a tiny little box in a window always felt like a very adult and sophisticated thing to do. Did you ever watch Jacques Pepin’s cooking show (the one he did from his own kitchen)? He always had herbs from his own garden. And it was usually chives. I swear, Jacques puts chives on everything. And who doesn’t want to be like Jacques?
The thing is, it’s easier (and faster) than you think. Because you actually don’t even need the box near the window.
Here’s how it works
The part of most vegetables that hits the cutting board last — the root end, the base, the white nub — is the part that grows back. So a shallow dish of water on the counter can turn what you would have composted into a second harvest, with no seeds, no soil, and no waiting. I have spent the last six weeks testing every vegetable on the regrow-in-water lists circulating on social media. Some of them genuinely work. Some are wishful thinking dressed up as a hack.
Five vegetables produced real, repeatable second harvests on my kitchen counter. The timing for each is below, the setup that actually works, and the ones I would skip even though they show up on every “regrow your scraps” infographic on the internet.
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Before you scroll
Green onions, romaine lettuce, celery, bok choy, and lemongrass are the five vegetables I would actually recommend regrowing from scraps in water. Specifically, each produces a usable second harvest within one to two weeks. After that, the yield drops sharply — so use the regrow trick for one or two cycles per scrap, then start fresh.
Why this actually works (a quick biology note)
Plants regrow from a tissue called the meristem — clusters of undifferentiated cells that retain the ability to divide and produce new shoots, roots, and leaves. So in the vegetables on the list above, the meristem sits at the base of the plant, near the root. When you cut off the leaves or stalks, the meristem is still alive. And given water and light, it does what it would do in the ground — produce new growth.
This is also why most root vegetables (carrots, beets, parsnips) do not regrow into the same vegetable. Specifically, the meristem is in the leafy top, not in the root you eat. So you can grow new leaves — useful for cooking — but not new carrots.
The five vegetables that genuinely work
1. Green onions — the easiest win
This is the regrowing experiment I would start everyone on. Specifically, save the bottom two inches of the white root end of a bunch of green onions. Stand them root-down in a small glass with about an inch of water. Place on a windowsill with morning sun. Within three to five days, new green shoots will emerge from the top.
Snip the new growth when you need it, leaving an inch of green attached so the plant keeps producing. You can repeat the snip-and-regrow cycle up to four times before the yield drops off. So one $0.79 bunch of green onions effectively becomes 5 to 10 weeks of fresh garnish for the cost of changing the water every two days.
2. Romaine lettuce — one good second cut
Save the base of a romaine head, cutting at about two inches above the root. Set it in a shallow dish with half an inch of water (the base should sit in water; the cut surface should be dry). Place it on a sunny windowsill or under a small grow light if your kitchen is dim. New leaves will push up from the center within five to ten days.
The catch with romaine: you get one good second harvest, not endless cycles. So the regrown leaves are smaller and slightly more bitter than the original, but plenty good for sandwiches or a side salad. After that, the base starts to brown and is best composted.
3. Celery — the one to transplant
Celery is similar to romaine but with a more robust meristem, which means you can get more out of it if you transplant. Specifically, save the bottom two inches of a celery bunch. Stand it in shallow water for five to seven days. So new tender stalks will emerge from the heart, and tiny roots will start to develop at the base.
Once you see roots, transplant the base to a small pot of soil. The plant will then continue producing stalks for months. So this is the regrow project that crosses from “fun kitchen experiment” to “actual ongoing harvest.”
4. Bok choy — the fast win
Bok choy is the most generous of the regrowable vegetables. Specifically, save the bottom two inches of a head and stand it root-down in shallow water. The base sends up new tender leaves within a week. So if you cook with bok choy regularly, this is the highest-yield project on the list.
As with celery, transplant once roots form. You can get a full second head of bok choy in three to four weeks from the transplanted base. The flavor is identical to the original, slightly milder.
5. Lemongrass — the longest game, the biggest payoff
Lemongrass takes the longest to start but produces the most over time. Specifically, stand the stalks root-end down in two inches of water. Roots and new shoots appear in one to two weeks. So once roots are visible, transplant to a small pot with well-draining soil.
A single transplanted stalk can produce 10 to 20 new stalks over a growing season. That is meaningful in cooking terms — a $4 bunch from the grocery store becomes a year’s supply of fresh lemongrass for Thai curries, marinades, and tea.
What you actually need to do this
The setup is simple. Specifically, you need a shallow water vessel, decent light, and clean (filtered or chlorine-evaporated) water. So if your tap water is heavily chlorinated, let it sit out for a few hours before using it — chlorine slows root development.
- Bormioli Rocco shallow glass dishes (set of 6) — clear glass lets you watch root development. The 3-inch depth fits every vegetable on this list.
- Brita 10-cup pitcher — if your tap water is heavily chlorinated. Filtered water meaningfully accelerates root development for lettuce and lemongrass.
- Sharp kitchen shears — for snipping new green-onion shoots cleanly. A dull cut crushes the meristem and slows the next cycle.
- Bootstrap Farmer terracotta seedling pots — small drainage-friendly pots for the celery, bok choy, and lemongrass transplants. The terracotta lets soil breathe.
- Espoma Organic Potting Mix — well-draining and organic. The drainage matters more than the brand — vegetable bases rot in dense potting soil.
- SANSI 24W full-spectrum grow bulb — useful if your kitchen does not get direct morning sun. Screws into a regular E26 lamp socket and runs on a $4 timer.
When to snip-and-keep versus transplant
The decision is straightforward. Specifically, vegetables with shallow meristems and short produce cycles (green onions, romaine, herbs) do well as snip-and-keep on water alone. So you get fast cycles, you do not need to involve soil, and the harvests are quick.
Vegetables with deeper meristems and the ability to form true roots (celery, bok choy, lemongrass) reward transplanting once roots develop. The transition usually means waiting until you see one to two inches of white root in the water, then moving the base into a small pot with well-draining soil. So a clean transition gives you weeks or months of additional harvest rather than days.
Vegetables I would skip
The “regrow everything” lists circulating on Instagram and Pinterest include plenty of vegetables that technically grow new leaves but do not deliver a useful second harvest. So here is what I would not bother with:
- Carrot tops. The green tops regrow, but they are bitter and limited in culinary use. Specifically, you cannot regrow the orange root portion at all — carrots only set their root once.
- Beet greens. Same issue as carrots. The greens regrow but in a small quantity, and the beet itself is gone.
- Leeks. Technically work, but the regrown stalks are skinny and grass-like. The pay-off is much smaller than green onions.
- Cabbage cores. Show up on lists but rarely produce more than a few small leaves before bolting or rotting.
- Fennel bulb. Similar issue — produces some small fronds but no usable second bulb. Better to buy fresh.
Common questions
How often should I change the water?
Every two to three days for the snip-and-keep vegetables (green onions, romaine). For the transplant candidates (celery, bok choy, lemongrass), change the water daily until you see roots form. So fresh water prevents algae, bacteria, and the slow rot that ends most regrow experiments early.
Do I need a grow light?
No, but it helps if your kitchen does not get direct sun for at least four hours. Specifically, green onions and lemongrass tolerate low light better than romaine, celery, and bok choy. So if you only have a north-facing window, start with green onions and lemongrass.
How long does each scrap keep producing?
Green onions: 4 to 6 cycles over 4 to 6 weeks. Romaine and bok choy: one solid second harvest, then start over. Celery and lemongrass: indefinite if transplanted into soil after roots form. So treat regrowing as a way to stretch a single grocery purchase — not as a replacement for a garden.
Is the regrown produce as nutritious as the original?
The first cycle is essentially the same. After that, nutrient density drops — the meristem is drawing from the stored carbohydrates in the original base, which gets depleted. So this is one reason to transplant into soil for the longer-term harvests — the plant can then pull new nutrients from the potting mix.
Will my kitchen smell weird?
Only if the water gets stagnant. Specifically, change the water on schedule and rinse the base each time, and there is no detectable smell. So the most common reason for a smelly setup is letting the water sit longer than three days.
What your compost was telling you
The part of the vegetable that hits the compost first is the part that is most alive. So what looks like waste is the most biologically active piece of the whole plant. And in five specific cases — green onions, romaine, celery, bok choy, and lemongrass — you can hand the meristem a small dish of water and a sunny windowsill and let it do the second-harvest work for you.
This is the rare kitchen lifehack that actually delivers what its Instagram caption promises. The list is short. The setup is small. And the savings are real. So pick one of the five tonight, save the base from dinner, and start a small jar by the window.
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Joseph has been writing and editing for a wide variety of publications over the last decade. He has written extensively about all aspects of wellness for publications ranging from Playboy to Civilized.
