How to Plant Green Onions Indoors: Regrow Scallions From Kitchen Stumps

Planting green onions indoors from scraps is the easiest way to keep fresh scallions growing year-round—no garden required. 🌱 I've regrown dozens of bunches from grocery store leftovers, and the secret is in the setup: just water, light, and patience.

You'll have snippable greens in 2-3 weeks, and the process is so simple even my black thumb can't mess it up.

The magic happens in a shallow container with damp paper towels or a tiny pot of soil. All you need is the white base of a green onion, a few inches of water or moist paper towels, and a sunny windowsill.

No fancy tools, no expensive supplies—just what you already have in your kitchen. The key is keeping the roots moist but not soggy, and giving them enough light to stay upright.

By week three, you'll be harvesting fresh green onions for cooking, and the plants keep producing for 4-6 weeks. The flavor is sweeter than store-bought, and you'll never buy scallions again. Plus, it's a great project to do with kids—they love watching the new growth appear overnight.

If your onions get leggy or flop over, just trim the tops and place them back in water—they'll regrow perfectly. This method works in any season, from winter to summer, and you can even keep a continuous supply going by rotating new scraps every few weeks.

Ready to grow your own?

What you need

Step-by-step instructions for growing green onions indoors

Here's how to turn those scraps into fresh, flavorful green onions in just weeks.

Save the 1-inch base of your green onions after cutting the green tops—this is your starter. Rinse off any dirt or debris, then trim away any wilted or bruised parts. You'll need 4 healthy stumps to grow a full serving of regrown green onions. Place them in a shallow bowl of room-temperature water so just the bottom ½ inch is submerged.

Change the water every 2 days to prevent bacterial growth. You'll see tiny white roots emerge within 3-5 days—that's your signal the stumps are ready for planting. Here's the thing: don't let them dry out, even for a day. Roots need consistent moisture to establish.

Use 4 small containers (like 4-6 inch pots or even recycled yogurt cups with drainage holes) filled with well-draining potting mix. Make a small hole in the center of each container with your finger, then place one stump in each hole. Cover the roots lightly with soil, pressing gently to secure the stump upright. Leave the white base exposed—this is where new growth will emerge.

Don't bury the stumps too deeply. If the white base is completely covered, the plant may rot before sprouting. Water lightly after planting until the soil feels damp 1 inch down. Place the containers in a spot with bright, indirect light—a windowsill facing east or west works best. Too much direct sun can scorch the tender new leaves.

Keep the soil consistently moist but never soggy. Water when the top ½ inch feels dry to the touch, which should be about every 2-3 days. You'll notice new green shoots emerging from the base in 5-7 days. This is the moment that matters: once the shoots reach 2-3 inches tall, you can harvest them like fresh green onions.

If your green onions grow leggy or pale, they need more light. Move them to a spot with 4-6 hours of indirect sunlight daily. A simple LED grow light on a timer can work too—just keep it 6 inches above the plants. Avoid overwatering now. Too much moisture causes the stumps to rot before the greens mature.

When the green tops reach 6-8 inches tall, snip them just above the white base with clean scissors. You'll have enough for a full serving of green onions—perfect for garnishes or stir-fries. Don't worry about killing the plant: the stump will regrow new greens in 1-2 weeks if you keep it in water or soil.

For a continuous supply, harvest every 2-3 weeks and replant the stump in fresh potting mix. I like to keep one stump in water on my counter for quick regrowth and the others in soil for a steady harvest. Real talk: the flavor is just as fresh as store-bought, and you'll save money too.

Tips & tricks for regrowing green onions indoors

Here's what nobody tells you about turning scraps into a steady harvest of fresh green onions.

Stump Selection Matters: Choose only the healthiest stumps with firm, white bases and no signs of bruising. I learned this the hard way—using wilted stumps means waiting weeks for growth, if they even sprout at all. After cutting your green onions, rinse the stumps immediately and store them upright in a glass of water in the fridge until ready to plant. This keeps them crisp and ready to root.

Light is the Game-Changer: Those 4-6 hours of indirect light are non-negotiable for healthy growth. I've seen stumps grow leggy and pale when placed in dim corners, but moving them to a sunny windowsill (especially east-facing) makes all the difference. For winter growing, a simple LED grow light on a timer works wonders—just keep it 6 inches above the plants to prevent scorching.

Harvesting Without Killing the Plant: The key to continuous supply is knowing exactly where to cut. Always snip just above the white base where the regrowth happens. I use clean kitchen scissors for this—it's faster than a knife and gives you a cleaner cut. After harvesting, the stump will regrow in 1-2 weeks if you keep it moist and in good light.

Soil vs. Water Regrowth: While the instructions mention both methods, I've found water regrowth is fastest for quick harvests (ready in 1-2 weeks), while soil-grown plants produce sturdier stems. For a mix of both, keep one stump in water on your counter and plant the others in soil. This gives you flexibility—water for fast regrowth, soil for steady supply.

Frequently asked questions

Got questions about growing green onions indoors? You're not alone—here are some of the most common ones, answered for your convenience!

Can I regrow green onions from store-bought scraps?

Store-bought green onions often have roots still attached. Simply trim the base 1–2 inches above the roots, place it in a shallow container with water, and watch them regrow in about 1–2 weeks. No soil needed for regrowth!

How long does it take for green onions to grow indoors?

With the right conditions, you’ll see visible growth in 7–14 days—but full harvest-ready greens take about 3–4 weeks. Patience pays off, especially if you keep the soil moist and provide bright light!

What if my green onions turn yellow or wilt?

Yellowing or wilting usually means overwatering or poor drainage. Let the soil dry slightly between waterings, and ensure your container has drainage holes. If leaves droop, trim them back and give your onions a little more light!

Do I need to use soil, or can I grow them in water?

Both work! For water-only growth, keep the base submerged in 1 inch of water, changing it every 2–3 days. For soil, use well-draining potting mix and keep it lightly moist. Soil-grown onions may last longer before needing a haircut.

Can I reuse the same green onion scraps multiple times?

Yes! Once your green onions reach 4–6 inches tall, snip the tops and let them regrow. You can repeat this process 3–5 times before the scraps weaken. Just refresh the water or soil as needed to keep them thriving!

Wrapping up and next steps

Growing green onions indoors is a simple, rewarding, and cost-effective way to enjoy fresh herbs year-round without breaking a sweat! 🌱 With just a little water, sunlight, and patience, you’ll have vibrant regrowth in weeks—perfect for adding flavor to meals or sharing with friends.

Now that you’ve mastered the basics, why not expand your indoor garden? Try growing other kitchen scraps like lettuce from the base or herbs like basil or cilantro. Happy growing—your taste buds (and wallet) will thank you!