How to Regrow Vegetables from Kitchen Scraps: 12 Foods You Can Grow for Free

Americans throw away 30 to 40 percent of the food they buy. That is roughly 120 billion dollars worth of food heading to landfills every year. But here is the thing most people never realize: many of the scraps you toss in the trash — the root ends of green onions, the base of a head of lettuce, the heel of a celery stalk — are not waste at all. They are living plant material that can grow into new food. On your kitchen counter. In a glass of water. For free.

You do not need a garden. You do not need seeds. You do not need any experience. Regrowing vegetables from kitchen scraps is the most accessible entry point to growing your own food that exists. It costs nothing, takes five minutes to set up, and delivers visible results within days. If you have ever been curious about food growing but felt like you needed land, tools, or knowledge to start — this is your permission slip. Grab a jar, save your scraps, and watch food grow on your windowsill.

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Why Regrowing from Scraps Actually Works

This is not a kitchen hack or a life hack or a Pinterest gimmick. Regrowing from scraps is basic plant biology. Plants are fundamentally different from animals in one critical way: they retain the ability to generate entirely new organs — roots, stems, leaves — from existing tissue throughout their entire lives. The technical term is meristematic tissue, and it is present in root nodes, stem bases, and growth points of virtually every vegetable you buy.

When you cut the top off a carrot or the base off a head of lettuce, you are not killing the plant. You are separating a piece that still contains active growth cells. Given water, light, and a little time, those cells activate and begin producing new tissue. Roots reach downward to find nutrients. Shoots push upward toward light. The scrap becomes a plant again.

Some vegetables are better candidates than others. The best ones share two traits: they have an intact base or root node (the part where roots originally grew), and they store enough energy in their tissue to fuel the initial regrowth before new roots and leaves can take over. Green onions, lettuce, and celery are champions at this because their bases are dense with stored energy and active growth cells. Garlic and ginger work because each clove or chunk is essentially a self-contained starter kit with everything the plant needs to launch new growth.

The 12 Best Vegetables to Regrow from Kitchen Scraps

These are ranked roughly from easiest to most ambitious. Start with the first three — they are nearly foolproof — and work your way down the list as you build confidence.

1. Green Onions / Scallions

If you regrow one thing from this entire list, make it green onions. They are the gateway experience that turns skeptics into believers. The process takes 30 seconds to set up and produces visible results within 24 hours.

How to do it: Next time you use green onions, cut them as you normally would but save the bottom 1 to 2 inches — the white part with the root hairs still attached. Place them root-side down in a small glass or jar with about an inch of water. Set the jar on a windowsill with decent light. That is it.

Within a day, you will see the green shoots starting to grow from the center. Within 5 to 7 days, you will have full-length green onions ready to cut again. Snip what you need from the top, leaving the white base in the water, and they will regrow again. You can get 3 to 5 harvests from a single set of root ends before they lose vigor. Change the water every 1 to 2 days to keep it fresh.

For unlimited green onions, transfer the rooted ends to a small pot of soil after the first water harvest. In soil, they will keep producing for months. A single bunch of green onions from the store — $1.50 — can supply your kitchen indefinitely.

2. Romaine Lettuce

The base of a romaine lettuce head is a regrowth machine. Most people chop off the leaves and toss the bottom two inches into the trash. That bottom piece is where all the new growth happens.

How to do it: Cut the leaves off a head of romaine, leaving the bottom 2 to 3 inches intact. Place the base cut-side up in a shallow bowl with about half an inch of water — enough to submerge the bottom without drowning the top. Set it in a bright spot. Change the water daily.

Within 3 to 5 days, new leaves will begin emerging from the center of the base. They start small and pale but turn green and grow quickly once they get going. After 10 to 14 days, you will have enough new leaves for a small salad. The regrown leaves will be smaller and slightly more bitter than the original head, but they are perfectly good eating. For a bigger, better harvest, transfer the base to soil once roots appear — the plant will produce a fuller head of leaves. For a deeper dive into growing your own salad greens, check out our complete guide to growing lettuce indoors.

3. Celery

Celery regrows from its base almost identically to romaine lettuce. The bottom inch or two that you normally discard contains everything the plant needs to produce new stalks.

How to do it: Cut the stalks off a head of celery, leaving the bottom 2 inches. Place the base cut-side up in a shallow dish with about half an inch of water. Set it somewhere bright and change the water every day or two.

New tiny stalks and leaves will emerge from the center within 5 to 7 days. Let them grow for 2 to 3 weeks in water, then transfer to a pot with soil for stronger growth. The celery you grow from scraps will be thinner than store-bought celery — it is more like celery leaves and thin stalks — but the flavor is excellent and works beautifully in soups, stir-fries, and stocks. Full-size celery stalks require transplanting to a garden bed or large container with rich soil and consistent moisture.

4. Bok Choy

Bok choy regrows aggressively from its base, and the new growth is tender and delicious. If you cook with bok choy regularly, this is a no-brainer.

How to do it: Cut the leaves off the bok choy, leaving the bottom 2 inches. Place in a shallow bowl with water covering the bottom half. Keep it in indirect sunlight and change the water every day.

New leaves start appearing within 3 to 4 days, growing from the center outward. Bok choy tends to regrow faster and more vigorously than lettuce. After 1 to 2 weeks, transfer to soil for continued production. The regrown leaves are perfect for stir-fries, soups, and salads. Like celery, the regrown version will be smaller than what you originally bought, but the flavor is spot-on.

5. Garlic (Garlic Greens)

You are not going to grow a full head of garlic on your windowsill — that takes months in the ground. But you can grow garlic greens, which taste like a mild, garlicky chive and work beautifully as a garnish, in scrambled eggs, or chopped into salads.

How to do it: Take a garlic clove (or a whole head that has started sprouting in your pantry — even better) and place it in a small container with water just covering the bottom of the clove. Or simply plant individual cloves an inch deep in a pot of soil, pointed end up.

Green shoots appear within 5 to 7 days. Let them grow to 6 to 8 inches tall and snip from the top. They will regrow for several rounds. If you want to grow full garlic bulbs, that is a different project — check our complete garlic growing guide for the full process, which involves planting in fall and harvesting the following summer.

6. Ginger

Fresh ginger from the store is a living rhizome — an underground stem — and it wants to grow. If you have ever found a piece of ginger in your fridge with little bumps or green tips poking out, you have already seen this in action.

How to do it: Look for a piece of ginger with visible growth buds — small bumps or nubs on the surface, ideally with a greenish tint. Soak the ginger in water overnight to remove any growth inhibitors. Then plant it 1 to 2 inches deep in a wide, shallow pot with well-draining potting mix, buds facing up. Water lightly and keep in a warm spot with indirect light.

Ginger is slow. Expect to wait 2 to 4 weeks for the first green shoots to emerge. But once it starts, it grows steadily. After 8 to 10 months, you can harvest new ginger by gently pulling the plant and breaking off what you need, leaving some rhizome in the soil to keep growing. Fresh homegrown ginger has a brighter, more complex flavor than store-bought, and one piece of ginger from the grocery store can eventually produce pounds of new ginger over time.

7. Potatoes and Sweet Potatoes

Every potato with "eyes" — those little sprouts that appear when a potato sits in the pantry too long — is a potential plant. Sweet potatoes are even more cooperative: they produce "slips" (sprouted shoots) that grow into new plants easily.

How to do it (potatoes): Cut a potato so that each piece has at least one or two eyes. Let the cut pieces dry for a day or two (this prevents rot). Plant each piece 4 inches deep in a large container or garden bed with the eyes facing up. Water consistently and mound soil around the stems as they grow.

How to do it (sweet potatoes): Suspend a sweet potato halfway in a jar of water using toothpicks, or place it in a shallow dish of water. Within 2 to 4 weeks, it will produce slips — leafy green shoots growing from the eyes. Once slips are 5 to 6 inches long with roots, twist them off and plant them in soil. Each slip becomes a new sweet potato plant.

Potatoes and sweet potatoes need more space than windowsill crops — a 10-gallon container or garden bed works best. But the payoff is real: a single potato can produce 5 to 10 new potatoes, and sweet potato slips from one tuber can generate multiple plants that each produce several sweet potatoes.

8. Beet Greens

You cannot grow a new beet root from the top of a beet. But you can grow beet greens — and beet greens are delicious, nutritious, and expensive to buy separately. They taste earthy and slightly sweet, and work raw in salads or sauteed like spinach.

How to do it: Cut the top off a beet, leaving about an inch of the beet attached to the greens' base. Place it cut-side down in a shallow dish with a small amount of water. Keep it in a bright spot and change the water regularly.

New leaves emerge from the center within a week. They will not be as large as the original beet greens, but they are tender and flavorful. Transfer to soil for stronger, more sustained leaf production. This works with red beets, golden beets, and chioggia beets equally well.

9. Carrot Tops (Greens Only)

Let's be clear upfront: you will not grow a new carrot root from a carrot top. The orange root is a one-time deal. But carrot tops produce lovely, feathery greens that taste like a cross between parsley and carrots. They are excellent in pesto, chimichurri, salads, and as a garnish.

How to do it: Cut the top inch off a carrot — the part where the greens originally grew. Place it cut-side down in a shallow dish of water. Within a week, new green fronds will sprout from the top.

Keep the water fresh, and within 2 to 3 weeks you will have a small bouquet of edible carrot greens. Transfer to soil for continued production. These greens are packed with vitamin K and potassium, and their flavor is something most people have never tasted because grocery stores sell carrots with the tops already removed.

10. Lemongrass

If you buy fresh lemongrass from the grocery store or an Asian market, you are holding a cutting that is ready to become a full plant. Lemongrass roots incredibly easily in water.

How to do it: Place lemongrass stalks in a jar of water, submerging the bottom 2 to 3 inches. Set in a sunny spot. Change the water every few days.

Roots will appear within 1 to 2 weeks, and new growth sprouts from the top. Once roots are an inch or two long, transfer to a pot with soil. Lemongrass grows into a beautiful, fragrant clump that produces stalks for cooking year-round in warm climates, or seasonally on a sunny windowsill or patio. One bundle from the grocery store can eventually produce more lemongrass than you will ever need.

11. Basil

Basil is technically an herb, not a vegetable, but it belongs on this list because it roots from cuttings so easily and saves you the most money per ounce of any plant you can regrow. Fresh basil at the grocery store costs $2 to $4 for a small package. One cutting can produce an unlimited supply.

How to do it: Take a stem of basil about 4 inches long (from a store-bought bunch or a living basil plant). Remove the bottom leaves, leaving just the top set. Place the stem in a glass of water so the bottom 2 inches are submerged. Set in a bright spot but out of direct scorching sun.

Roots appear within 7 to 10 days. Once roots are an inch long, transfer to a small pot or windowsill planter with potting mix. Pinch the growing tips regularly to encourage bushy growth, and you will have fresh basil on demand for months. One cutting from a $3 grocery store package can produce a plant that yields $50 or more worth of basil over a season. Pair your homegrown basil with homegrown tomatoes and you have a caprese salad that costs nearly nothing.

12. Green Cabbage

Cabbage regrows from its base similarly to lettuce and bok choy, though more slowly and with slightly less vigor. It is worth trying if you cook with cabbage regularly.

How to do it: Save the bottom 2 inches of a cabbage head after removing the outer leaves for cooking. Place the base in a shallow dish with about half an inch of water. Keep in a bright location and change water daily.

New leaves begin forming from the center within 1 to 2 weeks. They grow slowly but steadily. Transfer to soil after 2 to 3 weeks for better results. You will not grow a full cabbage head from a scrap — that requires a full garden setup — but you will get fresh, tender cabbage leaves that work well in stir-fries, wraps, and soups.

What You Need to Get Started

The beauty of regrowing from scraps is the zero-barrier entry. You likely already have everything you need in your kitchen right now.

• Clear glass jars or cups: Mason jars, drinking glasses, small vases — anything that holds water and lets you see the roots developing. Clear containers let you monitor water quality and root growth without disturbing the plant.
• A bright windowsill: South-facing or west-facing is ideal, but any window that gets 4 to 6 hours of light works for most scraps. East-facing windows work fine for green onions and lettuce.
• Fresh water: Tap water is fine for most scraps. If your tap water is heavily chlorinated, let it sit out for 24 hours before using. Change the water every 1 to 2 days — this is non-negotiable. Stagnant water breeds bacteria that will kill your scraps.
• Shallow dishes: For lettuce, celery, bok choy, and other base-regrowers, a shallow bowl or plate with a lip works better than a deep jar. You want the base sitting in water without being fully submerged.
• Potting soil (optional for water phase, essential for long-term growing): Any standard potting mix works. Do not use garden soil in containers — it compacts and drains poorly. Once your scraps have roots, transferring to soil dramatically improves growth and production.

Common Mistakes and How to Avoid Them

Regrowing from scraps is forgiving, but a few common errors can sabotage your results. Avoid these and your success rate goes from average to near-perfect.

Not changing the water

This is the number one killer. Stagnant water becomes a breeding ground for bacteria and algae within 48 hours. The water turns cloudy, starts to smell, and the scrap rots instead of growing. Change the water every single day for best results, or at minimum every other day. It takes 15 seconds. Make it part of your morning routine — refill your coffee, change your scrap water.

Too much water, too little air

For base-regrowers like lettuce, celery, and bok choy, the top of the base needs to stay above the waterline. Submerging the entire scrap causes rot at the top where new growth should emerge. Use just enough water to cover the bottom half to one third of the base. The cut surface should stay dry.

Not enough light

Scraps will start regrowing in low light, but they quickly become leggy, pale, and weak without adequate sunshine. The initial sprouting can happen almost anywhere, but sustained growth requires a bright windowsill with at least 4 to 6 hours of light. If your kitchen is dark, move the jars to your brightest window — even if that is in the living room or bedroom.

Expecting grocery-store size produce

Water-regrown vegetables will be smaller, thinner, and sometimes more bitter than what you originally bought. That is normal. The scrap has limited energy reserves and no access to soil nutrients. If you want larger, more robust regrowth, transfer to soil as soon as roots appear. Adjust your expectations for the water phase — it is a starter, not the final product.

Giving up too soon

Green onions show results in a day. Ginger takes a month. Different scraps have wildly different timelines. Do not throw away a scrap after a week because nothing is happening — some plants just need more time. As long as the scrap is firm (not mushy) and the water is clean, keep going.

When to Transfer from Water to Soil

Water is a starting medium, not a permanent home. Every scrap you regrow will eventually need soil if you want it to keep producing. Here is how to know when and how to make the transition.

The right timing

Transfer when you see roots that are 1 to 2 inches long and the plant has active new growth (new leaves or shoots emerging). For green onions, this is after the first harvest in water — about 7 to 10 days. For lettuce and celery, wait 10 to 14 days until roots are visible at the base. For basil cuttings, wait until roots are at least an inch long and branching, usually 10 to 14 days.

How to transfer

1. Fill a pot with moist potting mix (not soaking wet, not dry — damp like a wrung-out sponge).
2. Make a hole deep enough to bury the roots plus about an inch of the base or stem.
3. Place the rooted scrap in the hole and gently press soil around it. For lettuce and celery bases, bury the base up to where the new growth is emerging.
4. Water gently to settle the soil around the roots.
5. Keep the pot in bright, indirect light for the first 2 to 3 days while the plant adjusts, then move to direct sun.

The plant may look droopy or sad for a day or two after transplanting. This is transplant shock and it is normal. Keep the soil moist (not waterlogged) and resist the urge to fuss with it. Within a week, the plant will have anchored its roots in the soil and new growth will accelerate noticeably. For scraps that graduate to soil, using a rooting hormone powder on the roots before planting can speed up establishment, though it is entirely optional.

Essential Gear for Regrowing Scraps

You need nothing to get started — a jar and water are enough. But once you catch the regrowing bug and want to scale up, these three tools make the process cleaner, easier, and more productive.

What to Grow Next

Regrowing from kitchen scraps is the first step. Once you see food growing on your windowsill — something you made happen with nothing more than a glass of water and a scrap you would have thrown away — the question stops being "Can I grow food?" and starts being "What else can I grow?"

The answer is: a lot. If you enjoyed regrowing lettuce, our guide to growing lettuce and salad greens indoors shows you how to scale up to a continuous harvest of mixed greens. If garlic greens from a clove got you excited, the full garlic growing guide walks you through growing entire heads of garlic. And if you want the most rewarding food-growing experience a beginner can have, growing tomatoes at home is the natural next step — one plant, one sunny spot, and you are eating food that tastes nothing like what the grocery store sells.

The scraps on your counter are not trash. They are starter kits. Every root end, every base, every sprouted clove is asking you the same question: are you going to throw me away, or are you going to grow something? Now you know how. The jar is waiting.