5 Vegetables You Can Regrow From Scraps in 7–14 Days

The 5 fastest vegetables you can regrow from kitchen scraps are green onions, celery bases, romaine lettuce hearts, bok choy bottoms, and garlic cloves. All can show visible growth within 2–7 days using only water, a small glass or dish, and a bright windowsill — no special equipment or deep soil required.

Below are step-by-step instructions for each vegetable, including ideal containers, light and water conditions, common mistakes to avoid, and how to maximize repeat harvests. Each method is designed for urban apartments, small balconies, and beginner gardeners working with kitchen scraps.

1. Green Onions (Scallions)

What to keep: The white bulb end with roots attached, plus 2–5 cm of the pale stem above the roots. Trim away any soft or mushy parts before starting.

Container: A small glass, jar, or espresso cup works best. The roots should sit in water while the stem base stays above the waterline.

Water level: Add about 1–2 cm of water, just enough to cover the root zone. Do not submerge the full stem, which encourages rot.

Light and temperature: A bright windowsill with indirect light and room temperature around 18–24°C is ideal. They tolerate lower light but grow slower.

Timeline: New green shoots usually appear within 2–4 days. Cut the greens when they reach about 10–15 cm tall, leaving the lower white base and roots intact for another cycle.

Water maintenance: Change the water every 1–2 days to reduce odor and bacterial buildup. Rinse the roots gently if they feel slippery.

Harvest and repeat cycles: One store-bought bunch can often give 2–4 cuttings of green tops before vigor declines. For longer regrowth, move the rooted bases into a small pot with potting mix once roots are 2–3 cm long.

Best for: Fast garnish, small kitchens, windowsills, soups, noodles, eggs, salads. Not suitable for: Producing large onion bulbs indoors or long-term growing without soil.

2. Celery Bases

What to keep: Cut off the bunch for cooking, leaving the bottom 4–6 cm of the stalk cluster intact. This base contains the crown where new growth emerges.

Container: A shallow dish, bowl, or jar lid. Place the base cut-side up or resting on its side with the bottom touching water.

Water level: Add about 1 cm of water to the dish, enough to touch the bottom of the base. Keep only the lower portion in water, not the upper cut edge.

Light and temperature: Bright indirect light for about 4–6 hours daily. Celery prefers steady moisture and does not tolerate sitting in foul, stagnant water.

Timeline: Central leaves may begin to grow from the crown within 4–7 days. Outer stalks often soften or discolor; this is normal. After 7–14 days, roots and fresh leaves should be visible.

Water maintenance: Replace the water every 1–2 days and rinse the dish if it feels slimy. Stagnant water is the most common cause of rot.

Transition to soil: Once roots appear, transplant the base into moist potting mix with the crown above the soil surface. Water lightly every 2–3 days or when the top 1–2 cm of soil feels dry.

Harvest and use: Regrown celery is best treated as a herb-like leaf crop. The leaves have strong flavor and are useful in soups, stocks, and sauces. Even 1–2 tablespoons of chopped leaves can season a full pot.

Best for: Celery leaves, seasoning, stock, soups, sauces. Not suitable for: Regrowing full supermarket-sized celery stalks indoors or in dark rooms.

3. Romaine Lettuce Hearts

What to keep: Cut the leaves above the core, leaving roughly 3–5 cm of the stem base intact. The heart should be firm with no soft or brown spots.

Container: A shallow dish or bowl. Set the base with the cut side down so the bottom touches the water.

Water level: Add 1–2 cm of water touching the bottom of the base. Do not submerge the entire crown, which can cause the core to rot.

Light and temperature: Bright indirect light for about 4–6 hours daily. Avoid hot direct sun through glass, which can wilt the tender new leaves.

Timeline: New leaves often emerge from the center within 3–6 days. The regrown plant usually will not form a full dense head; instead, it produces small, tender leaves.

Water maintenance: Change the water every 1–2 days. If the base starts to smell or feel mushy, discard it — it has rotted and will not recover.

Harvest: Pick small leaves when they are about 5–10 cm long. Cut outer leaves first to allow the center to keep producing.

Best for: Small salad additions, sandwich leaves, quick indoor experiments. Not suitable for: Full lettuce-head production or hot, mold-prone containers.

4. Bok Choy Bottoms

What to keep: Cut away the leafy tops for cooking, leaving the flat base of the bok choy intact. The base should be firm with visible center points where new leaves emerge.

Container: A shallow dish or bowl. Place the base flat with the cut side down so the bottom edge sits in water.

Water level: Add about 1 cm of water, just enough to touch the bottom of the base. Keep the upper surface dry to reduce the risk of rot.

Light and temperature: Bright indirect light for 4–6 hours daily. Bok choy prefers cool room temperatures around 15–22°C and may bolt or wilt in very warm kitchens.

Timeline: New small leaves often sprout from the center within 3–7 days. The regrown leaves will be smaller and more tender than the original plant.

Water maintenance: Change the water every 1–2 days. Rinse the base gently if any residue builds up on the cut surface.

Transition to soil: Once small roots appear, transplant the base into a small pot with moist potting mix. Keep the new leaves above the soil line and water lightly every 2–3 days.

Harvest: Pick leaves when they reach about 5–8 cm long. The base may continue producing smaller leaves for a second or third cycle.

Best for: Small stir-fry additions, baby greens, quick windowsill projects. Not suitable for: Full-sized bok choy heads or very warm indoor environments.

5. Garlic Greens (From Sprouted Cloves)

What to keep: Use whole garlic cloves that have started to sprout a small green shoot. The clove should be firm, not soft or moldy.

Container: A small glass, jar, or shallow dish. Place the cloves upright with the root-facing end down.

Water level: Add just enough water to touch the bottom of the clove. Do not submerge the whole clove, which causes it to rot before roots form.

Light and temperature: A bright windowsill with indirect light and room temperature around 18–24°C works well. Garlic greens tolerate lower light but grow slower.

Timeline: Roots usually appear within 2–4 days, and green shoots grow quickly. Harvest the greens when they reach about 10–15 cm tall.

Water maintenance: Change the water every 1–2 days. If the clove starts to smell or feel soft, remove it immediately to prevent spreading bacteria.

Harvest: Cut the green tops with scissors, leaving the clove and roots intact. The clove may produce 2–3 rounds of greens before energy is depleted.

Transition to soil: For continued growth, plant rooted cloves in a small pot with potting mix, burying the clove just below the surface. Water lightly every 2–3 days.

Best for: Garlic-flavored garnish, quick windowsill projects, using cloves that have already sprouted in the pantry. Not suitable for: Growing full garlic bulbs indoors or using soft, moldy cloves.

Common Mistakes and How to Avoid Rot or Slow Growth

Too much water: Submerging the entire base or crown is the most common cause of rot. Only the root zone or bottom edge should touch water.

Infrequent water changes: Stagnant water grows bacteria and algae. Change water every 1–2 days and rinse containers regularly.

Wrong light conditions: Direct hot sun through glass can wilt tender regrowth, while dark corners slow growth. Aim for bright indirect light for 4–6 hours daily.

Damaged or soft bases: Start only with firm, healthy scraps. Soft, mushy, or moldy bases rarely regrow and often contaminate the water.

Ignoring temperature: Most kitchen-scrap vegetables prefer 15–24°C. Very warm kitchens above 27°C can cause wilting, bolting, or faster bacterial growth.

How to Transition From Water to Soil (Optional)

Once roots are 2–3 cm long, you can move bases into small pots with standard potting mix. This extends the useful life of the plant compared with water-only regrowth.

Use a pot at least 10–15 cm deep with drainage holes. Place the rooted base so the crown or new leaves sit above the soil surface. Water lightly every 2–3 days or when the top 1–2 cm of soil feels dry.

Place the pot on a bright windowsill and avoid overwatering. For leafy regrowth like celery, lettuce, and bok choy, a basic potting mix with no fertilizer is sufficient for short-term harvests.

Harvest Timeline and Maximizing Regrowth Cycles

Green onions: First harvest in 2–4 days; repeat cycles every 7–10 days for 2–4 rounds.

Celery: First leaf growth in 4–7 days; usable leaves by 10–14 days. Transition to soil for longer harvests.

Romaine lettuce: First leaves in 3–6 days; small harvests by 7–10 days. Usually 1–2 harvest cycles before vigor declines.

Bok choy: First leaves in 3–7 days; small harvests by 7–14 days. May produce 2–3 cycles if transitioned to soil.

Garlic greens: First harvest in 7–10 days; repeat every 7–10 days for 2–3 rounds from the same clove.

To maximize regrowth, always leave the root zone or base intact when harvesting, maintain clean water, and move plants to soil once roots are established. This approach turns a single grocery purchase into multiple small harvests of fresh garnish and greens.