Vegetables
Growing purple green onions is like having a vibrant, edible rainbow in your garden—those bold striped leaves add color and flavor while regrowing from scraps. 🌱 I’ve grown them for years, and they’re the easiest, most rewarding allium you’ll ever plant.
The secret? They thrive in even small spaces, tolerate poor soil better than regular onions, and keep producing for months.
Start with sets or seeds in well-draining soil, and they’ll sprout in just 5-7 days. Purple green onions love full sun but handle partial shade, making them perfect for containers or garden edges.
Water consistently (about 1 inch per week), and you’ll harvest lush, regrowable greens in as little as 3-4 weeks. The purple hues deepen in cooler weather, adding a striking contrast to salads or garnishes.
What makes them special is their versatility—use the whole plant, from mild white bulbs to peppery purple tops. Even after cutting, the roots regrow if you keep them moist. My favorite trick?
Plant them in pots on the patio so I always have fresh onions for cooking. They’re also pest-resistant, so you won’t waste time battling aphids or onion flies.
Perfect for beginners, small gardens, or anyone who loves low-maintenance crops with high rewards. Once you try them, you’ll wonder why you didn’t plant purple green onions sooner—they’re the ultimate regrowable superstar. Let’s get those sets in the ground!
📚 In This Guide
- What you need
- Instructions
- Tips and common mistakes
- Wrapping up and next steps
What you need
- ● Purple green onion bulbs or scraps: 1 bunch (or 3–4 inches of leftover root ends from store-bought onions). Choose organic if possible for better regrowth.
- ● Container: A shallow dish (6+ inches wide) or small pot with drainage holes. A repurposed yogurt cup or mason jar works too!
- ● Potting soil: 2–3 cups of well-draining, organic potting mix (avoid garden soil—it can compact and suffocate roots).
- ● Water: Room-temperature or slightly warm (not cold).
- ● Small hand trowel or spoon for planting.
- ● Spray bottle (for gentle watering).
- ● Scissors (to trim scraps to 1–2 inches of root).
- ● Clear plastic wrap or humidity dome (to create a mini greenhouse for faster sprouting).
- ● 🌞 Light: A sunny windowsill (6+ hours of indirect light daily) or a grow light (12+ hours for faster growth).
- ● 💧 Patience: Sprouts may take 1–2 weeks to appear, and harvest-ready onions in 3–4 weeks!
- ● 🧼 Cleanliness: Rinse scraps gently to remove soil/dirt before planting.
How to grow purple green onions from scraps
Here's how to grow vibrant purple green onions that keep coming back—no soil required!
🌱 Step 1: Select and Prepare Your Onion Scraps
Save the white base of store-bought purple green onions, about 2-3 inches long, with at least one inch of roots still attached. Rinse off any dried-on soil and trim off any brown or wilted root ends with clean scissors. You'll need 4 scraps total for a fresh harvest.
Place the scraps in a shallow bowl of lukewarm water—just enough to cover the roots but not submerge the white base. Change the water every 2-3 days to prevent bacteria buildup. You'll see new green shoots within 3-5 days, signaling your scraps are ready for the next step.
💧 Step 2: Transfer to a Sunlit Window
Once the shoots reach 2-3 inches tall, transfer the scraps to a small container (like a mason jar or glass) with fresh water. Place the container in a spot with bright, indirect light—a south-facing window is ideal. Avoid direct midday sun, which can scorch the tender leaves.
Keep the water level just enough to cover the roots, adding more as needed. You'll notice the shoots grow faster in this setup, reaching harvestable size (6-8 inches) in about 1-2 weeks. The purple stripes will deepen as they mature, giving you those stunning visuals.
☀️ Step 3: Harvest and Regrow for Continuous Supply
Cut the green onions ½ inch above the base when they reach your desired length. This encourages the plant to regrow, and you'll have a fresh harvest in 1-2 weeks. Store the harvested greens in the fridge for up to 5 days, or freeze them for longer storage.
After cutting, simply return the scraps to the water and continue the cycle. With this method, you'll get multiple harvests from a single bunch of green onions. The flavor stays fresh and vibrant, making it a cost-effective way to enjoy homegrown greens year-round.
✂️ Step 4: Optional Soil Transfer for Long-Term Growth
If you want to extend the life of your green onions beyond water regrowth, transfer the scraps to a small pot (4-6 inches wide) filled with well-draining potting mix. Plant the scraps 1 inch deep, leaving the white base exposed above soil level.
Water lightly and place the pot in bright, indirect light until established. Once new growth appears, you can transplant to a garden bed or larger container. Purple green onions thrive in cool weather (50-75°F) and will continue producing for months.
Tips & tricks for perfect purple green onion regrowth
Here's what nobody tells you about maximizing your purple onion harvest—these little tricks make all the difference!
Selection Tip: Look for scraps with at least one inch of healthy roots—these are the ones that'll give you the most vigorous regrowth. I always check for firm, white roots when selecting scraps at the store. The thicker the base, the better chance you have of getting multiple harvests.
Light Strategy: That bright, indirect light in Step 2 is crucial—direct sun can actually bleach out those gorgeous purple stripes. I've found that placing my container on the east-facing windowsill gives perfect morning light without the harsh afternoon rays. If you don't have a sunny window, a grow light on a timer works beautifully too.
Harvest Hack: When cutting your onions, leave that ½ inch above the base—this tiny stump actually helps the plant regrow faster. I've seen some people cut too close and slow down the regrowth cycle. Also, always use clean scissors to prevent disease transmission between harvests.
Soil Transfer Tip: If you choose the optional soil transfer, don't bury the white base completely—leave about ½ inch exposed above soil level. This keeps the growing point accessible to light, which is essential for continuous regrowth. I've had the best success with a mix of potting soil and perlite for drainage.
Pro Tips for Purple Green Onions
- Here's what nobody tells you about maximizing your purple onion harvest—these little tricks make all the difference!
- Selection Tip: Look for scraps with at least one inch of healthy roots—these are the ones that'll give you the most vigorous regrowth.
- Light Strategy: That bright, indirect light in Step 2 is crucial—direct sun can actually bleach out those gorgeous purple stripes.
Frequently asked questions
Got questions about purple green onions?
You’re not alone! Here are answers to the most common queries—from growing tips to culinary tricks—so you can make the most of these vibrant, flavor-packed veggies.
Can I regrow purple green onions from scraps like regular green onions?
The process is identical to regrowing regular green onions. Simply trim the white and light purple ends (about 1 inch), leaving the roots intact, and place them in a shallow dish of water. Keep them in bright, indirect light, and change the water every 2–3 days. In 1–2 weeks, you’ll have fresh regrowth!
How long do purple green onions take to regrow from scraps?
Patience pays off! With consistent care (like fresh water and sunlight), you’ll see tiny green shoots in about 5–7 days. Full regrowth—ready for chopping—usually takes 10–14 days. If your scraps are slow to sprout, try placing them in warmer water (around 70°F) to speed things up.
What’s the best way to store purple green onions to keep them fresh?
Store them like regular green onions: wrap the white bulb ends in a damp paper towel, then place them in a sealed plastic bag in the fridge. They’ll stay crisp for 1–2 weeks. For longer storage (up to 3 weeks), trim the roots and store them upright in a glass of water in the fridge—like a mini hydroponic setup!
Are purple green onions spicier or milder than white or green onions?
Purple green onions pack a slightly sharper kick than white onions but are milder than green onions. The flavor is a mix of sweet, tangy, and oniony—with a visual pop! Use them like scallions in dishes where you want color + flavor, like tacos, salads, or stir-fries. For a milder taste, harvest them younger.
Can I grow purple green onions in soil instead of water?
Yes! If you prefer soil, plant the scraps in a small pot with well-draining potting mix, keeping the roots covered but the green tops exposed. Water lightly to keep the soil moist (not soggy). Place the pot in bright, indirect light and expect regrowth in 2–3 weeks. Just avoid overwatering—root rot is a sneaky risk!
Wrapping up and next steps
Purple green onions are a versatile, nutrient-packed superstar that’s as easy to grow as it is delicious to eat! 🌱 Their striking color and ability to regrow from scraps make them a game-changer for home cooks and gardeners alike.
Whether you’re adding them to salads, soups, or reviving your kitchen countertop with new growth, these onions prove that small efforts yield big rewards.
Ready to elevate your meals and green thumb skills? Grab those scraps, follow the simple steps, and watch your kitchen (or garden!) transform. Next up: Experiment with recipes or share your purple onion harvest with friends—because the best flavors are always worth celebrating!