5 Easy Tips to Grow Green Onions Indoors
You can grow green onions indoors with almost no effort. You don't need soil, you don't need fancy equipment, and you can use the scraps from the ones you already bought at the store. Here are five easy tips to help you grow green onions indoors, no matter how small your space is. #GrowGreenOnions #IndoorHerbGarden #KitchenGarden #RegrowFood #UrbanHomesteading
A few years ago, I started a small jar of green onions on my kitchen counter. Within a week, I had fresh green shoots ready to snip into my soups and salads. It was so easy that I wondered why I had ever bought them from the store. Now I always have a jar of green onions growing on my windowsill.
Tip 1: Use Kitchen Scraps (The Easiest Way)
This is the cheapest and simplest way to grow green onions indoors. You don’t need seeds or starter plants—just the green onions you already have.
What to do:
- When you use green onions in your cooking, save the white ends with the roots attached. Cut them so you leave about 2 to 3 inches of the white part.
- Place the root ends in a small glass or jar. Add just enough water to cover the roots—about ½ inch of water. Do not submerge the whole white part.
- Put the jar on a sunny windowsill.
- Change the water every 2 to 3 days to keep it fresh and prevent bacteria from growing.
Within a few days, you will see new green shoots growing from the top. In about a week, you will have green onions ready to harvest.
This method gives you 3 to 5 harvests from one set of scraps before the plant runs out of energy. You can also plant the root ends in soil for a longer-lasting supply.
My advice: I keep a small jar on my kitchen counter at all times. Whenever I use green onions, I pop the scraps in the jar, and I never run out. It is the easiest kitchen garden you can have.
Tip 2: Give Them Enough Light
Green onions are not too picky about light, but they do need some to grow well.
The simple rule: Place your green onions in a spot that gets at least 4 to 6 hours of sunlight per day. A south-facing window is ideal for full sun. East or west-facing windows also work well. If you don’t have a sunny window, you can use a grow light for about 12 hours a day.
If your green onions are not getting enough light, they will grow thin and pale. If they are in too much direct sun, the tips may dry out and turn brown. For the best results, aim for bright, indirect light. Rotate your container every few days so all sides get even light.
Tip 3: Use the Right Container
You don’t need anything fancy to grow green onions. The simplest containers work perfectly.
For water method:
- A small glass, jar, or even a shot glass works well.
- The container should be tall enough to hold the roots in water without the white part sitting in water.
- A clear glass is useful because you can see the water level and root growth.
For soil method:
- Use a small pot that is about 4 to 6 inches deep with drainage holes.
- A shallow dish or a recycled plastic container with drainage holes also works.
- Fill it with regular potting soil—not garden soil.
Tip 4: Water Correctly
Overwatering is the most common mistake with green onions. They are forgiving, but they don’t like sitting in soggy conditions.
The simple rule:
- For water method: Change the water every 2 to 3 days. Rinse the roots gently before putting them back in fresh water.
- For soil method: Water when the top inch of soil feels dry. Water thoroughly until it drains out the bottom, then let the soil dry out slightly before watering again.
My advice: I learned the hard way that letting the water sit for too long makes the roots slimy. Changing the water regularly makes a huge difference. If you notice a bad smell or slimy roots, wash the container and start fresh.
Tip 5: Harvest Often
This is the fun part. The more you harvest, the more your green onions will grow.
How to harvest:
- Snip the green tops with scissors when they are about 4 to 6 inches tall.
- Leave about 1 inch of green above the white part. The plant will keep growing from the center.
- Do not pull the plant out—cut what you need and let the rest keep growing.
How often to harvest: You can harvest leaves every few days if you have a strong plant. Your green onions will regrow quickly after each cut. For the water method, you can harvest up to 3-5 times before the plant runs out of energy. For the soil method, you can harvest continuously for months. Eventually, the plant may slow down or stop producing new leaves. When that happens, start fresh with new scraps.
Quick Reference Table: Green Onions at a Glance
| Factor | What to Do |
|---|---|
| Starting method | Save white ends with roots (2-3 inches) |
| Growing medium | Water (jar or glass) or potting soil (small pot) |
| Light | 4-6 hours of sun per day (south-facing window is best) |
| Water | Change water every 2-3 days; for soil, water when top inch is dry |
| Harvest | Snip when 4-6 inches tall, leave 1 inch of green |
| Container | Glass jar for water, small pot with drainage for soil |
My Personal Green Onion Routine
Here is what I actually do in my own kitchen. You can copy this.
When I use green onions:
- I save the white ends with the roots.
- I place them in a small jar with ½ inch of water.
- I put the jar on my kitchen windowsill.
Every 2-3 days:
- I change the water.
- I rinse the roots gently.
- I check the growth.
When they are 4-6 inches tall:
- I snip what I need for cooking.
- I leave about 1 inch of green for regrowth.
Every few weeks:
- If the leaves start looking thin, I start a new batch with fresh scraps.
Since I started this routine, I have not bought green onions from the store in years. I always have fresh ones on my windowsill, ready to add to my meals.
The Bottom Line
Growing green onions indoors is one of the easiest kitchen gardening projects you can try. All you need are green onion scraps, a jar of water, and a sunny windowsill.
Change the water every few days, harvest when the greens are 4-6 inches tall, and you will have fresh onions all year round. For a longer-lasting supply, plant the scraps in potting soil and enjoy even bigger, more flavorful greens.
I went from buying green onions at the store to growing them on my windowsill. You can do this too. Start with a few scraps and enjoy the satisfaction of growing your own food.
