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Regrow vegetables from kitchen scraps: what works and how

Some of the vegetables you buy can grow again from the parts you would usually throw away. A root end in a glass of water can give you fresh greens within days. This guide shows which scraps really regrow, how to start them, and what kind of harvest to expect.

Regrow vegetables from kitchen scraps: what works and how
Photo: Lombroso, Public domain · Wikimedia Commons
Easiest start
Green onions and celery base
First new growth
3–7 days in water (estimated)
Water change
Every 2–3 days
Realistic goal
Extra greens, not a full new crop

Which scraps really regrow?

A scrap can regrow only if it still has a growing point: a root plate, a bud or a node. Leaves alone will not grow back.

  • Root plate: green onions, leeks, celery, romaine lettuce, bok choy and fennel regrow leaves from the flat base where the roots were.
  • Buds: garlic cloves and potato eyes are buds that can grow into whole plants.
  • Nodes: basil, mint and other soft herbs root from stem cuttings taken just below a leaf joint.
Green onions regrow quickly from the white root end.
Green onions regrow quickly from the white root end. Photo: Colin, CC BY-SA 3.0 · Wikimedia Commons

Water or soil?

In water

  • Fast and easy to watch; good for kids and windowsills.
  • Best for green onions, celery, lettuce bases and herb cuttings.
  • Plants run out of food after a few harvests.

In soil

  • Slower start but stronger, longer-lived plants.
  • Needed for garlic, potatoes and anything you want to keep growing.
  • Move water-rooted scraps to soil once roots are about 2 in long.

Regrowing a base in water, step by step

  1. Cut: Leave about 1–2 in of the base on green onions, celery or lettuce. Keep the root plate intact.
  2. Set up: Stand the base in a shallow glass or dish with about ½–1 in of water. The cut top must stay dry.
  3. Light: Place it on a bright windowsill, out of hot midday sun.
  4. Fresh water: Change the water every 2–3 days and rinse the base if it feels slimy.
  5. Harvest: Snip new leaves when they are a few inches tall, leaving the base to grow again.
  6. Move to soil: When roots are well formed, plant the base in a pot of moist potting mix for longer life.

Garlic, potatoes and other buds

  • Garlic: Plant single cloves pointed end up, about 1 in deep. Green shoots can be cut like chives within weeks; a full bulb needs a cool season and many months outdoors.
  • Potatoes: A sprouted potato or a chunk with two eyes, dried for a day, can be planted in a deep container. Use seed potatoes for a reliable crop, since store potatoes may be treated to slow sprouting.
  • Ginger and turmeric: A plump piece with visible buds can sprout in a warm spot in shallow soil, but it is slow.
A lettuce base gives a few rounds of tender leaves.
A lettuce base gives a few rounds of tender leaves. Photo: Geographer, CC BY 1.0 · Wikimedia Commons

Light, warmth and food

Light

  • A bright window gives the best leaves.
  • Weak light gives pale, stretched growth.
  • A small grow light helps in winter.

Warmth

  • Most scraps prefer normal room temperature.
  • Keep away from cold glass and radiators.

Food

  • Water-grown scraps live on stored energy.
  • After 2–3 harvests, move them to potting mix or start a fresh scrap.

Keep it clean

Wet plant tissue spoils easily, so a little hygiene makes a big difference:

  • Use a clean glass and fresh tap water.
  • Remove any soft, brown or smelly parts at once.
  • Do not let water cover the cut top.
  • Rinse harvested greens well before eating.
  • Start again with a new scrap if mold appears.

Realistic expectations

Regrowing scraps is a fun way to stretch your groceries and learn how plants grow, but it will not replace a vegetable patch. Celery and lettuce give thin, leafy regrowth rather than a new head. Green onions are the best performers and can be cut several times.

⚠️ Avocado, mango and citrus pits can grow into attractive houseplants, but fruit from them is rare and can take many years (estimated).

Common problems and fixes

The base turns slimy and smellsBacteria are growing in the water. Rinse the base, trim soft tissue and change the water daily.
New leaves are pale and floppyToo little light. Move it to a brighter window or under a grow light.
Growth stops after a few weeksStored energy has run out. Plant the base in potting mix or start a new one.

Frequently asked questions

Can I eat the regrown leaves?

Yes. Regrown green onion, celery and lettuce leaves are edible; rinse them as you would any fresh greens.

Do I need special water?

No. Plain tap water is fine. What matters most is changing it often.

Why did my store potato not sprout?

Some store potatoes are treated to slow sprouting. Seed potatoes from a garden center are more reliable.

How many times can I harvest?

Green onions can often be cut 3–4 times (estimated); celery and lettuce usually give one or two smaller rounds.

Plants you can regrow or grow on

CeleryOnionLettuceGarlicPotatoBasilMintLeek

Sources

Last updated: 2 November 2026