Last updated on February 27th, 2019,

How To Plant, Grow, Care And Harvest Onions

Onions are a mandatory ingredient in most dishes and they are something we all have in a kitchen. But, how do onions grow? Luckily this is a tough plant that can be grown literally anywhere. It is easy to plant, it requires a low amount of care and it is easy to harvest. We will help you by offering you a complete guide on how to plant, care and harvest these plants.


The first part is to plant onions. You have two options. The first one is to purchase seeds that will have to be planted in small cups and watered regularly. Once onions are one inch in diameter, you will transfer them to the soil. This is a more complicated and more demanding way for growing onions.

The second method is much simpler. You can purchase small onions and directly plant them into the soil. Keep in mind that the soil needs to be at least 20 degrees Fahrenheit and it must be rich in nitrogen. Here is how you plant onions.

  1. Choose a desired place in the garden and make rows. The length can be any you want, but the distance between the rows should be a couple of inches.
  2. Make rows elevated compared to rest of the soil and pour water on them.
  3. Place onions one inch in depth and cover them with dirt. Make sure there are 4 inches apart between the onions.

A few things to keep in mind. Always plant onions in the spring. The soil should be damp and adding fertilizer is more than just beneficial. Sprouted onions can be planted as well, but they won’t be productive as those that haven’t sprouted yet.


Now when you know How to grow Onions you must know how to care for them. Make sure you water them once a week and apply 1 inch of water. Use nitrogen fertilizer a few times per month and repeat the step until the onion bulbs are visible. Once they are slightly above the ground, stop using fertilizer or it will damage them!

You will have to make sure there is no roots and other plants or grass around the bulbs. They will literally steal the nutrients from the onions and you will get a much weaker production.

Two issues can be common while caring for your onions. The first one is thrips. These are small insects that feed on the leaves of onions. Use a piece of paper, place it next to the onion and hit the leaves. If you notice brown inserts which are very small by the way, your onions have thrips. There are few useful solutions which are effective and all of them are based on insecticidal soap. Spray the plants a few times a week and you are done.

Onion maggots are a bigger concert, literally. They will lay eggs at the base of the bulbs which will be ruined within days. These maggots are common during a rainy season. To eliminate them, you will have to remove onions from the ground. A much better solution is a precaution. Use netting over the onions and cover all the edges with soil. This will prevent maggots from reaching your onions. Growing onions is much better if you don’t have to encounter this threat!


The last step in our how to grow an onion guide is harvesting. You will see that harvesting is actually fun. Keep in mind that onions are ready once the top ends are yellow and look old. It is usually at the end of a summer or during autumn, depending on when you planted them. All you have to do is to follow these steps.

  1. Loosen the soil around the onions.
  2. If you followed all the instructions in our how to grow onion guide, you will have a full basket from just a few rows. Pull the onions out from the ground.
  3. Cut out the roots and the tops one inch from the bulbs.
  4. Make sure you leave them on the ground to dry from moisture.
  5. Store them at a temperature of 40-50 degrees Fahrenheit.

Want to know where do onions grow? The answer is anywhere and they can be grown and harvested in your own garden. You were able to see simple guide and we revealed all the points you will have to consider when growing onions. If you used fertilizer and water as we mentioned, you will have large bulbs and delicious onions.


How do you grow onions like a professional farmer? Now you know the answer and we believe that you are ready for your first plantation. They are cheap to plant and they don’t require a lot of care, so make sure you plant a lot of them. You can always sell some.

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