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Green onions are the gateway drug to growing your own food. You buy a bunch, use the green parts in cooking, and instead of throwing out the white root ends, you stick them in a glass of water. Within days, fresh green shoots emerge. Within two weeks, you have new green onions ready to harvest. The whole experiment costs nothing.
This is the easiest kitchen scrap regrowing project, and one of the most genuinely useful. Here’s exactly how.
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What you need
- A bunch of green onions from the grocery store
- A small jar, glass, or shallow container
- Water (room temperature, tap water is fine)
- A windowsill with some sun (any direction is okay; brighter is faster)
Total cost: zero. You already have everything if you cook.
The basic method (water)
- Buy a bunch of green onions. Use the green tops for cooking as you normally would.
- Cut the bunch so that 2-3 inches of white root end remains, with the roots still attached at the bottom.
- Place the root ends in a small glass with the roots submerged in about 1 inch of water. The cut tops should be above the water.
- Set the glass on a windowsill with daylight.
- Change the water every 2-3 days to keep it fresh.
- Within 2-3 days you’ll see new green growth from the cut tops.
- Within 7-14 days, you’ll have 4-6 inches of new green onion to harvest.
Once you harvest, leave the white root section in the water. It’ll regrow again. And again. A single bunch can produce 3-4 successive harvests in water before quality declines.
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The upgrade: transfer to soil
Water-grown green onions produce thinner, less robust shoots after the first few cycles. For long-term continuous supply, transplant to soil:
- Once your green onions have grown new roots an inch or two long in water (1-2 weeks), they’re ready for soil.
- Fill a 6-inch pot (or window box) with potting mix.
- Plant the green onions about 1 inch deep, spaced about 1-2 inches apart.
- Water gently to settle the soil.
- Place on a sunny windowsill or partial-sun balcony.
In soil, green onions grow indefinitely. Cut the green tops as needed; they regrow within 2-3 weeks. A single 6-inch pot can supply a household with green onions for a year or more.
Harvesting tips
- Cut about 1 inch above the white base, leaving plenty of green for regrowth.
- Use the cut greens immediately – they don’t store as well as garden-grown.
- Once a plant has been cut 4-5 times, growth slows. Replace with fresh root ends from a new grocery store bunch.
- For continuous supply, start a new round every 2-3 weeks. By the time the first batch slows, the next is ready.
Common problems
| Issue | Cause | Fix |
|---|---|---|
| Root end going slimy or smelly in water | Stagnant water | Change water every 1-2 days; rinse the glass |
| Green shoots growing thin and pale | Not enough light | Move to a brighter windowsill or add a small LED grow bulb |
| Roots not growing | Wrong end down, or root end died | The roots should always be in the water; the cut end up. If the root end has gone soft, start with fresh scraps. |
| Plants stop growing after several harvests | Nutrient depletion in water | Transfer to potting soil for long-term supply |
Other kitchen scraps that regrow
Once you’ve succeeded with green onions, a few more easy ones:
- Leeks: same method as green onions. Slower but works.
- Lettuce hearts: the white base of a head of romaine, placed cut-side-up in shallow water, regrows new leaves. Quality declines after one regrowth – more of a fun experiment than a real supply.
- Celery base: same method as lettuce hearts. Produces a small amount of new growth.
- Bok choy base: regrows leaves in water within a week.
- Garlic cloves with green shoots: plant the sprouting cloves in soil; the green shoots are edible chive-substitute.
- Ginger root: a piece with visible buds can be planted shallow in soil and grows over months.
None of these match green onions for ongoing yield. Green onions are uniquely well-suited to regrowing.
Cost comparison
A bunch of green onions in a grocery store: roughly $1-2. A pot of soil-grown green onions on your windowsill supplies a household for months. Over a year, the savings add up to $20-50 – which is admittedly small. The real value is convenience and freshness: walking 3 feet to snip an onion when cooking instead of running to the store, and the brightness of just-cut greens.
The bottom line
Growing green onions from scraps is the easiest possible introduction to growing food. Zero cost, zero risk, zero setup beyond a glass of water. Within a week you have a renewable supply of one of the most-used kitchen ingredients. For new gardeners worried about whether they have a green thumb, this is the experiment that proves you do.
For the next steps in beginner growing, see the 7 easiest plants for beginners and growing lettuce in containers.
Setting up a green onion station in your kitchen
Many home cooks dedicate a small spot to a continuous green onion supply. The setup:
- Two or three small glasses or mason jars on a windowsill.
- One bunch of green onions divided across the jars (3-4 root sections each).
- Set up succession – start a fresh jar every 2 weeks for continuous supply.
- Cover with a label noting the start date.
By rotating jars, you always have something to cut while others are regrowing. The setup takes 10 minutes and produces years of green onions for free.
Beyond green onions: other kitchen scraps that work
Once you’ve succeeded with green onions, expand the experiment:
| Scrap | Method | Time to harvest |
|---|---|---|
| Leeks (white root end) | Same as green onions | 2-3 weeks for first regrowth |
| Romaine lettuce heart | Place cut-side-up in shallow water | 1-2 weeks; one regrowth only |
| Celery base | Place in shallow water, replant in soil | 2-4 weeks; small new growth |
| Bok choy base | Shallow water; replant in soil | 1-2 weeks for leaves |
| Garlic cloves (sprouted) | Plant in soil shallow | 3-6 months for full bulbs |
| Ginger rhizome (with bud) | Plant shallow in soil | 6+ months for new rhizomes |
| Pineapple top | Cut and dry the top, plant in soil | 1-2 years for fruit (rare in home gardens) |
Green onions remain the easiest and most productive. The others are fun experiments but don’t replace buying.
From water to soil: when to transplant
Water-grown green onions decline in quality after 3-4 cuttings. Signs to transplant to soil:
- Greens growing noticeably thinner each cycle.
- Roots looking discolored or smelling off.
- Water turning cloudy faster than you can refresh.
To transplant: lift the root section out of water, fill a small pot with potting mix, plant the root section 1 inch deep, water gently. Place on a sunny windowsill or partial-sun balcony. Continue normal harvest cycles – in soil, productivity can continue for many months.
The cost-savings reality
Green onions at the grocery store cost roughly $1-2 per bunch. A regular cook uses 2-3 bunches per month. With kitchen-scrap regrowing, your annual cost drops from $30-50 to $0 for green onions.
The bigger benefit isn’t really money – it’s the convenience of always having fresh green onions at arm’s reach when cooking. The grocery store run for a single ingredient is eliminated; the freshness boost is immediate.
