How to Plant Green Onions Indoors: Regrow Scallions From Store Buys in Weeks

Planting green onions indoors from store-bought scallions is the easiest way to grow fresh herbs year-round—no seeds or garden required. 🌱 I’ve regrown scallions for three winters straight, and the trick is all in how you prep the roots and keep them happy.

The first harvest comes in just 2-3 weeks, and with proper care, you’ll get continuous regrowth for months.

You’ll need a shallow container (even a glass of water works), potting soil, and the scallions themselves. The key is planting them root-end down, just 1-2 inches deep, and keeping the soil consistently moist—not soggy.

A sunny windowsill or a basic grow light is all they need to thrive, and you’ll avoid the $3-per-bunch store price forever.

By the time you’re snipping fresh green onions for sandwiches, stir-fries, or salads, you’ll wonder why you ever bought them pre-cut. The flavor stays vibrant, the regrowth is foolproof, and you’ll never waste another bunch again.

Plus, it’s a project even kids can help with—just watch those little roots transform into lush green shoots.

This method works in any climate, from dark apartments to sun-drenched kitchens. The only real mistake is overwatering (they hate wet feet), but beyond that, it’s impossible to kill these. Next time you buy scallions, grab a few extra and turn them into your own indoor herb factory.

What you need

Step-by-Step instructions for regrowing green onions indoors

Here's how I turn wilted store-bought scallions into a fresh, continuous harvest in just weeks.

Grab a bunch of green onions with firm white bases—avoid any with soft or shriveled roots. I like to use organic store-bought scallions because they're less likely to have been treated with growth inhibitors. Rinse the roots thoroughly under cool water to remove any dirt or residue, then trim the roots to about 1 inch—this prevents rot while leaving enough root to regenerate.

Here's the trick: I place the trimmed bases in a glass of lukewarm water (not cold) and let them soak for 30 minutes. This hydrates the roots and kickstarts regrowth. You'll see the roots begin to plump up slightly—that's your signal the process has started. Keep the water level high enough to cover about ½ inch of the roots.

Choose a shallow container with drainage—like a small pot or even a repurposed yogurt cup with holes poked in the bottom. Fill it with well-draining potting mix (I use a blend of 60% potting soil and 40% perlite for aeration). Moisten the mix until it's damp but not soggy—you should be able to squeeze a handful and have it hold together without dripping.

Create a small hole in the center of the soil with your finger, about 1 inch deep. Gently place one scallion base into the hole, pressing lightly around the sides to secure it. The white bulb should sit just below the soil surface, with the green tops peeking above. If you're planting multiple scallions, space them 2-3 inches apart to avoid crowding.

Place your container in a spot with bright, indirect light—a sunny windowsill works perfectly. Green onions need 6-8 hours of light daily, but direct midday sun can scorch the leaves. If your space is dim, supplement with a grow light positioned 6-12 inches above the plants for 12-14 hours per day.

Water gently whenever the top ½ inch of soil feels dry. I like to use a spray bottle for precision, misting the soil until it's evenly moist but not waterlogged. Overwatering is the fastest way to rot the bases—you'll know it's time to water when the soil surface looks slightly dry and pulls away from the pot edges.

In about 2-3 weeks, you'll notice new green shoots emerging from the base. This is your cue to start harvesting! Snip the green tops 1 inch above the soil line with clean scissors. The plant will regrow, and you can harvest every 1-2 weeks thereafter—just avoid cutting into the white bulb, as that slows regrowth.

Here's the thing—green onions are resilient. If you see the white bulb start to yellow or the leaves wilt, it's time to refresh the plant. Simply trim off the old growth, rinse the base, and replant it in fresh potting mix. With this method, I've kept a single bunch producing for 3-4 months before needing to start over.

If your scallions grow leggy (long, thin stems with sparse greens), they're stretching for light. Move them closer to your light source or add a grow light immediately. You'll see the stems thicken and leaves darken within a few days—that's your signal the plant is happy again.

To extend your harvest, I recommend rotating your scallions every 2-3 weeks. Simply replant the bases in fresh soil, and you'll have a new cycle of growth. Store-bought scallions often have a limited lifespan, but with this method, you'll have fresh green onions on demand—no garden required!

Tips & tricks for perfect indoor green onion regrowth

Turn your kitchen counter into a mini farm with these pro tips that'll keep your scallions thriving for months.

Root Revival: That 30-minute lukewarm water soak in Step 1 isn't just hydration—it's a wake-up call for dormant cells. I've found adding a pinch of cinnamon to the water can prevent bacterial growth during this critical stage. The roots will plump noticeably, and you'll see tiny white root hairs forming within 10 minutes. This is your green light to proceed to planting.

Soil Science: For Step 2, don't overlook the perlite-to-soil ratio. The 60/40 blend creates perfect aeration, but if you're using straight potting soil, mix in some coarse sand or vermiculite. I've had the best luck with scallions when the soil feels like a damp sponge—not sticky, not dry. Press the soil gently around each base to eliminate air pockets, which can cause rot. Think of it like giving your scallions a firm handshake at the soil party.

Light Strategy: The 6-8 hours of bright indirect light in Step 3 is non-negotiable, but here's the secret: rotate your container quarter-turn daily. This prevents your scallions from leaning toward one light source, creating stockier stems. If you notice leaves turning pale yellow, they're begging for more light—supplement immediately with a grow light on a timer. I keep mine on a 12-hour cycle to mimic natural daylight patterns.

Harvest Hack: When those first shoots appear in 2-3 weeks, resist the urge to harvest everything at once. Snip the outer leaves first, leaving the inner ones to keep photosynthesizing. This technique extends your harvest window by weeks. I've had scallions produce for months this way, with each harvest cycle yielding more robust regrowth than the last. Think of it as the plant's way of saying "thanks for not killing me."

Frequently asked questions

Got questions about growing green onions indoors? You’re not alone—here are answers to the most common ones to help you succeed!

Can I regrow green onions from store-bought ones?

Simply trim the roots (about 1 inch) and place them in a shallow container with water or soil. Most store-bought green onions are grown from seed, so they’ll regrow just like fresh ones. Just avoid pre-cut or dried varieties—they won’t sprout.

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

With proper care, you’ll see new growth in 1–2 weeks, and they’ll be ready to harvest in 3–4 weeks. Keep them in bright light (a sunny windowsill works) and change the water every 2–3 days for the fastest results.

What if my green onions aren’t growing?

No growth? Check these fixes:

• Light: Move them to a brighter spot (grow lights help if natural light is weak).
• Water: Keep roots submerged in water or moist soil—never let them dry out.
• Roots: If they’re mushy or rotting, trim off the bad parts and restart with fresh roots.

Do I need soil, or can I just use water?

Both work! For water regrowth, use a shallow container (like a mason jar) and change the water daily. For soil regrowth, use a small pot with well-draining soil—this mimics outdoor conditions better and may yield more robust growth.

How do I harvest green onions without killing the plant?

Harvest by cutting the green tops just above the soil line with clean scissors. Avoid cutting the roots—this keeps the plant alive for multiple harvests (up to 6–8 weeks!). Let the greens regrow between uses for a continuous supply.

Wrapping up and next steps

Growing green onions indoors is a simple, rewarding, and cost-effective way to enjoy fresh herbs year-round! With just a few basic supplies and a little patience, you’ll have a steady supply of crisp, flavorful greens in weeks.

Whether you’re a beginner or a seasoned plant parent, this method proves that regrowing food at home is easier than you think—so why not give it a try?

Now that you’re ready to start, take the first step today! Grab those leftover green onions from your fridge, follow the steps, and watch your kitchen transform into a mini garden. Happy growing—and enjoy those homegrown bites! 🌱✨