Regrowing Vegetables from Kitchen Scraps

Green onions (the reliable one)

1. 1Save the roots — Keep the white root end with healthy roots attached, trimmed about an inch above the roots.
2. 2Set in water — Stand root ends in a jar with about an inch of water so roots are submerged but cut ends stay above water.
3. 3Refresh water — Change the water every few days; harvest fresh green tops as they regrow.

Lettuce and honest limits

Place the bottom 3 to 4 cm of a lettuce head cut-side-up in shallow water in indirect light, changing the water every day or two; small leaves appear within a week. But a lettuce base won't regrow a full head, and the new leaves are often bitter. For a real crop, transplant to soil or start from seed instead.

→ Scrap-regrowing is a fun windowsill experiment, not a reliable way to grow full harvests.

Sources

Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.

• The Old Farmer's Almanac — How to Regrow Vegetables from Scraps — Green onion root ends resprout in water; lettuce base regrows small leaves but not a full head and can be bitter
• University of Michigan (SEAS) — Propagating Veggies from Kitchen Scraps — Regrowing scraps like green onions and lettuce bases in water on a windowsill; change water to prevent rot

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