How to Grow Spring Onions: The Definitive Planting Guide - Backyard Boss
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How to Grow Spring Onions: The Definitive Planting Guide

Not everyone likes the taste of spring onions, but would you consider consuming them more often if we told you how good they actually are for your health? They are rich in sulfur, they lower your blood sugar levels, help with your digestion, and are good in preventing colds and flu. On top of all that, they are super-easy to grow. Want to know how?

Spring Onions Growth FAQ

How Long Does It Take to Grow Spring Onions?

It usually takes around 8 weeks to grow spring onions, but regrowth only takes one or two weeks. They’re an easy vegetable to grow if you’re a beginner.growing spring onions outdoors in soil

Can You Grow Spring Onions from Cuttings?

Yes. Spring onions are a type of plant that can be regrown and give you fresh ingredients to work with at your disposal. What you need is the ends of onions that have roots growing from them in order to regrow.

Can You Grow Spring Onions from Onions?

You can grow spring onions from other spring onions, but not from a regular onion per se. However, you can use that regular onion to grow more regular onions, as you don’t really need seeds for either of these two varieties.

How Do You Regrow Spring Onions at Home?

The easiest way to regrow spring onions at home is by using mason jars and water. The spring onions you want to regrow need to have at least some roots at the bottom (the longer the roots are, the faster they will grow). You can trim the tops of your spring onions and place them inside a tall glass or a mason jar. You want to add water up to the point where the onions start turning green.

It is best if you use a clear jar because it helps you see what is going on inside the receptacle. When you notice that the water isn’t clear anymore, change it with fresh water. Placing the jar/glass next to a sunny window will also help with growth. You will notice how the green part of the onions starts to regrow after a few days. You can cut it off when it’s long enough and use it in your recipes.

How to Grow Spring Onions from Seeds

  • Spring onions will thrive if you plant them in soil with good drainage and in a sunny spot in your garden. Alternatively, you can also grow spring onions in smaller pots. Note that even if they do love the sun, these plants don’t require as much sunlight exposure as others do, so you should be just fine if you pick a spot with partial shade.
  • You want to make sure to break up the soil in the garden, as spring onions need loose soil. It is likely that the plants won’t thrive in clay-like soil. You can use a trowel for this process, but if you don’t want to do all the work at once, you can also go it gradually by using a rake over the ground every day a few weeks in advance before planting.
  • You want to add some garden lime if need be, as these vegetables are not fans of acidic soil. Fertilizer is an important part of pretty much every vegetable growth process, and with spring onions, general fertilizer should do the trick (you can also use organic fertilizer).
  • The best time to plant the seeds of your spring onions is between March and July. These plants work well with moderate weather. You want to make sure that the last frost of the season has passed, but you also want to avoid peak high temperatures. If you want to plant later in the summer/fall, look for varieties that are winter-hardy. That means they are resistant to cold temperatures and you can harvest them in spring.

planting onions in soil outdoors

  • When you’re ready to put the seeds into the ground, dig shallow holes (about half an inch deep) by using your fingers. You should leave about 18 inches in between two holes in the same row. Keep in mind that seeds need to be about 2 inches apart from one another in order to give your spring onions room to grow. You should leave at least 6 inches of space between two rows. Add the seeds to each hole when ready.
  • When all the seeds are into the ground, you can scatter some soil on top of them, about half an inch should suffice. This will protect the seeds from birds that might land and try to eat them.
  • Alternatively, you can also scatter the seeds freely onto the soil without having to dig holes for each. When you’re done, you can just rake the soil to make sure they are spread evenly across its surface. You will still have to cover them with soil, and whilst this method is faster, it also leaves a lot of seeds exposed to feathered predators.
  • You will have to water the onions when you notice the soil is getting dry. Make sure to avoid overwatering, as this will waterlog the seeds.
  • Make sure that the soil where the onions are planted is weed-free. Mulch is a good solution for keeping the soil moist and it also inhibits weeds from growing.
  • Spring onions are ready to harvest about 8 weeks after being planted. Mature plants measure about 6 inches in length. If you don’t pull out the spring onions when they reach a diameter of one inch, they will lose their flavor.
  • You can literally pull out the mature spring onion from the ground, but make sure that you grab it as close to the base as possible. If you have a trowel, you can also dig out the onion. Some people like to cut off the green part of the onion and use it in the kitchen, whilst leaving the root in the ground for further growth.


A delight to many salads, but also a flavor-packed ingredient for different types of soups, stews, and other cooked foods, the spring onion is probably one of the easiest vegetables to grow. The best part is that you can actually use the end of spring onions for regrowth, and all you need to do so is a clean container, water, and a sunny spot.

green onions and green knife on wooden cutting board