If you’ve purchased a bundle of green onions from the store that still have healthy, white roots at the base, congratulations! You’ve stumbled onto one of my favorite gardening hacks. You see, even though these green onions have been harvested, you can continue to regrow them. There are two easy ways to regrow green onions: in water and in soil. Both are valid and will result in healthy new green onion growth – perfect for salads and eggs! Let’s dive in.
Regrow green onions in water
Growing green onion scraps in water is a simple and easy way to regrow green onions without having to purchase more from the store. First, take the green onion scraps and place them in a cup or jar filled with water. Ensure the roots are submerged in the water and the green onion tops stick out. Place the cup or jar in a sunny spot and change the water every few days.
After a few days, you should start to see new growth in the green onion tops. Once the green onion tops are about 3 inches long, you can transfer them to a pot with soil and continue to water them. With proper care and attention, you should have a full batch of green onions in no time!
You can also keep your green onions in water, but eventually, they will fail to thrive. If you just want an extra harvest or two, feel free to keep them in water and not plant them. You can extend their lifespan by applying a basic water plant fertilizer each time you change the water.
Regrow green onions in soil
Above, we described a method of regrowing green onions in water that eventually call for your onions to be planted in soil, but you can actually skip the water step entirely if you want to cut to the chase and put them in the soil.
Regrowing green onion scraps in soil is a simple and easy way to get a continuous supply of green onions. To begin, cut the green onion at the base of the white bulb and leave about an inch of the white part intact. Place the green onion scraps in a shallow bowl of warm water and leave them to soak for a few hours. This soaking period gives your green onions the opportunity to rehydrate and gives them a better chance at survival.
After the onion scraps have soaked, plant them in a pot filled with soil or in the ground in your garden. Place the pot in a sunny spot and keep the soil moist. The green onion scraps will begin to develop new growth within a matter of days.
When to harvest
Green onions should be harvested when they reach a height of 4-6 inches. The leaves should be green and the bulbs should be firm. If the leaves become yellow or the bulbs become soft, then the onions should be harvested right away. Harvesting can be done by cutting the leaves off at the base of the bulb with a sharp knife or scissors. The leaves can be used for cooking or can be dried for later use. It is best to harvest green onions in the morning when the temperatures are cooler.