How to Grow Scallions From Bulbs: Regrow Green Onions in 7 Days

Your kitchen scraps can grow fresh scallions in just 7 days. 🌱 I’ve regrown green onions from store-bought bulbs so many times that my freezer is now stocked with regrown scraps instead of buying new.

The secret? A shallow container, water, and a sunny windowsill—no soil or fancy tools needed.

Start with firm, fresh scallions (the ones with roots still attached). Trim the roots to about 1 inch and place them in a shallow dish of water, leaving just the white bulb submerged.

Keep it in bright indirect light, changing the water every 2 days to prevent bacteria. Within a week, you’ll see 1-2 inches of fresh green regrowth—ready to snip and use.

This isn’t just a quick fix; it’s a sustainable habit. You’ll save money, reduce waste, and always have fresh scallions on hand for cooking. Plus, the process is so simple that even my black-thumb neighbor can’t mess it up.

Once the greens reach 4-6 inches, trim them back to encourage more growth. Repeat the process 2-3 times per bulb before it peters out. For long-term regrowth, try transferring the bulb to soil after the first harvest—it’ll keep producing for months.

What you need

Step-by-step instructions for growing scallions from bulbs

Here's how to coax fresh green onions from store-bought bulbs in just a week—no soil needed.

Grab 4 fresh scallion bulbs from the grocery store—look for ones with firm, white roots still attached. The roots should feel moist but not mushy. Trim off any wilted green tops and discard them. You'll want bulbs that are 3-4 inches long for best regrowth potential.

Cut ½ inch off the bottom of each bulb, just above where the roots begin. This exposes the base where new roots will emerge. Place the trimmed bulbs in a glass of water (about 2 inches deep) so only the cut ends are submerged. The water should cover the roots but not the bulb itself.

Set your glass of scallions in a spot with bright, indirect light—think east-facing windowsill or under fluorescent lights. Avoid direct sunlight at first, which can scorch the emerging greens. You'll see tiny white roots within 24-48 hours, and within 3-4 days, you'll notice pale green sprouts pushing through the top.

Change the water every 2 days to prevent bacterial growth. The water should stay room temperature—cold water slows regrowth, while warm water can rot the bulbs. If the water gets cloudy before your 2-day change, refresh it immediately.

Once 1-2 inches of green growth appear (usually 5-7 days), move the scallions to a sunny windowsill or under grow lights for 6-8 hours daily. Direct light deepens the green color and encourages faster growth. You'll see new leaves unfurl daily—this is your cue to keep the water fresh and the bulbs hydrated.

Harvest by snipping the outer greens when they reach 4-6 inches tall, leaving the bulb intact. The same bulb can regrow 3-4 times if you keep it in water and provide consistent light. Just trim the greens back to ½ inch above the bulb after each harvest to encourage fresh growth.

If you want to extend the life of your scallions beyond water regrowth, transfer them to potting soil after 10-14 days. Plant the bulb 1 inch deep in a small container with well-draining soil, leaving the top ½ inch exposed. Water lightly until the soil is moist but not soggy, and place in full sun (6+ hours daily).

Soil-grown scallions develop thicker roots and can produce greens for several weeks. Keep the soil evenly moist—never let it dry out completely. You'll harvest by cutting the outer stalks at the base, allowing the center to keep growing. This method works best in warm indoor conditions (65-75°F).

Tips & tricks for perfect scallion regrowth

Here's what nobody tells you about getting the most out of your regrowing scallions—these tricks make all the difference.

Root Exposure Matters: After trimming the ½ inch from the bulb base, let it sit uncovered in the water for 10 minutes before submerging. This brief exposure helps prevent rot by allowing any trapped air to escape. I learned this the hard way after losing three batches to soggy bulbs—always let that cut surface breathe first.

Light Transition Strategy: When moving scallions to direct light after 5-7 days, do it gradually over 24 hours. Start with 3 hours of direct sun on the first day, then increase by 1 hour daily. Sudden exposure can cause sunburn on the delicate new growth, turning them yellow or crispy. Think of it like sunbathing—ease into it!

Water Quality Tip: Use filtered or distilled water if possible, especially if your tap water has high chlorine levels. Chlorine can inhibit root growth and cause the water to cloud faster than the 2-day refresh schedule. If you must use tap water, let it sit out uncovered for 24 hours before using to allow chlorine to evaporate.

Harvesting Hack: Always harvest scallions in the morning when they're at their crispest. Use clean, sharp scissors to snip just above the bulb, leaving the ½ inch of stubble. This clean cut prevents the bulb from drying out and encourages faster regrowth. Store harvested greens wrapped in a damp paper towel in the fridge for up to 5 days—they'll stay fresher longer.

Frequently asked questions

Can I regrow scallions from store-bought bulbs?

Store-bought scallions (green onions) often have roots still attached—just trim the bulb, place the base in water or soil, and watch them regrow in days. Choose organic or fresh bulbs for the best results.

How long does it take for scallions to regrow?

With the right conditions (moisture, warmth, and light), you’ll see new growth in 3–7 days. For faster results, use a sunny windowsill or grow light. Patience pays off—harvest when greens reach 4–6 inches!

What if my scallions turn yellow or wilt?

Yellowing or wilting usually means overwatering (let soil dry slightly between waterings) or lack of light (move to a brighter spot). If roots rot, trim the bad parts and replant the healthy base in fresh soil.

Can I grow scallions indoors year-round?

Yes! Scallions thrive indoors with 6+ hours of light daily (use a grow light if needed). Keep them in a pot with drainage, rotate occasionally for even growth, and enjoy fresh greens every 2–3 weeks.

What can I do with leftover scallion tops after harvesting?

Don’t toss them! Chop leftover tops into soups, stir-fries, or homemade broth. You can also replant the bulb again—it’ll regrow 2–3 times before losing potency.

Wrapping up and next steps

Growing scallions from bulbs is a simple, rewarding, and cost-effective way to enjoy fresh green onions anytime! With just a few basic supplies and a little patience, you’ll have vibrant regrowth in under a week—perfect for adding flavor to your favorite dishes. 🌱

Now that you’re armed with the know-how, why not experiment with different varieties or share this trick with fellow gardeners? Try regrowing scallions from store-bought bulbs next time you’re at the grocery store—your kitchen (and taste buds) will thank you!