Onion Growing Stages: How to Grow Onions?

Onion Growing Stages: How to Grow Onions? Could you use think that onions were just those big, white, spongy things that made you cry when you cut them? Well, think again. The onion is actually one of the most amazing vegetables in the world. They’re not only healthy and delicious, but they’re also really easy to grow. 

In fact, onions are one of the easiest vegetables to grow in your garden. Onion is a vegetable that many people like to eat. It can be used in different ways, such as in salads, soups, and main meals. 

Onion has a lot of health benefits, including improving heart health, boosting bone density, and helping control blood sugar levels.

But when you want to grow onions, you need to know what stages they go through. This guide will tell you all about the stages of growing onions, from planting the seeds to harvesting the mature onions. 

So let’s get started.

The 6 Stages of Onion Growth Every Gardener Needs to Know

Growing onions is a simple and rewarding gardening experience that everyone can enjoy. From the moment the seed is planted, there’s a sense of anticipation as the tiny sprout breaks through the soil. 

Here are the six stages of onion growth that every gardener needs to know.

Stage 1: Planting the Seeds

When you want to add the flavor of onion to your cooking, you need to start by planting the seeds. But how exactly do you go about doing that? It’s actually quite simple. 

First, you’ll need some soil. Onion seeds need loose, well-drained soil in order to germinate properly. You can either purchase a bag of potting mix or make your own by mixing together equal parts sand, peat moss, and compost.

Once you have your soil ready, it’s time to plant the seeds. Sow the seeds ¼ inch deep and 12 inches apart in rows that are 24 inches apart. 

If you’re planting more than one row, make sure to leave enough space between each row so you can easily walk between them. Once the seeds have been planted, water them gently with a watering can or hose attachment set to a gentle trickle. 

Be careful not to overwater the seeds, as this can cause them to rot. After watering, keep an eye on the seedlings and water them whenever the top inch of the soil begins to dry out.

Onion Growing Stages
Onion Growing Stages

Stage 2: Germination

Germination means that the onion seeds have sprouted and are now growing into seedlings. In this process, the seed coats break open, and the tiny onion sprouts emerge. 

This process can take anywhere from a few days to a couple of weeks, depending on the temperature and humidity of your growing environment. In this process, the seed dissolves the outer skin for the embryo to grow. 

After the embryo develops, it creates the root and shoot systems. The roots develop downwards into the soil, and the shoot system grows upwards towards the surface and cooks food.

Once the germination process is complete and the seedlings have emerged, they will need to be thinned out. Thin the seedlings so that they are 4 to 6 inches apart. 

You can either transplant them into another location or simply pull them up by the roots and discard them.

Stage 3: The Seedlings Grow

After germination, the onion seedlings will begin to grow. At first, they will be very delicate and will need to be protected from strong winds and direct sunlight.

If you live in an area with a lot of wind, you may need to erect a temporary barrier around your seedlings to protect them. A simple way to do this is to drape a piece of burlap or a light sheet over the top of the seedlings.

During this stage of growth, tiny onion seeds develop into white, yellow, or red-leaf plants. The onion bulb will swell as the leaves continue to grow. This is the stage where the plant starts to photosynthesize and produce its own food.

Stage 4: Bulbing Begins

Once the seedlings have grown to be 4 to 6 inches tall, they will begin to form bulbs. The amount of time it takes for the bulbs to form will vary depending on the variety of onions that you are growing.

Some onions, such as red onions, will begin bulbing in as little as 50 days, while others, such as white onions, can take up to 120 days. Once the bulbs have begun to form, stop watering the onions.

Onion Growing Stages
Onion Growing Stages

Stage 5: Bulb Maturation Stage

During this stage, the onion plant maturation begins as all the leaves have turned brown and pale. The onion enters its reproduction phase, producing flowers on the stalk. The maturation process is fastened by reducing days as summer ends during this time.

Because of this, the bulb stores the plant’s carbohydrates at the cost of leaves. This stage is complete when the onion plant’s leaves have all died back, and the bulbs are fully mature.

Stage 6: Harvesting Time

The sixth and final stage of onion growth is harvesting time. Onions are typically ready to harvest when their tops start to fall over, and their necks are brown and dry. To harvest, simply pull the onions out of the ground and brush off any excess dirt.

Then, they can be stored in a cool, dark place where they will keep fresh for several months. So there you have it – the six stages of onion growth that every gardener needs to know. By following these simple steps, you can enjoy a bountiful harvest of delicious onions all season long.

Onion Growing Stages
Onion Growing Stages

What are the signs that your onion crop is ready for harvest?

Wondering when your onion crop is ready for harvest? Here are four signs to look out for:

  • The first sign is the color of the leaves. If they start to turn yellow or brown, it’s an indication that the onion is past its prime and won’t be as flavorsome as one that is freshly harvested.
  • Another sign is the size of the bulb. If it’s larger than usual, it’s probably ready to be harvested. However, if it’s smaller than usual, it’s best to leave it in the ground for a little longer.
  • The third sign is the appearance of the skin. If it starts to crack or peel, it’s time to harvest your onions.
  • Finally, if the roots start to push through the soil, this is another indication that your onion is ready to be harvested.

So there you have it – four signs that your onion crop is ready for harvest. Now all you need to do is get out there and start picking.


What kind of soil do onions grow in?

Soil is the most important factor in onion growing. Onions need loose, well-drained soil with a pH between 6.0 and 7.0. If your soil is too heavy or clay-like, it will need to be amended before planting onions. 

The best way to test your soil is to get a soil test kit from your local garden center or nursery. This will tell you the pH of your soil and whether or not it needs to be amended.


When is the best time to plant onions?

When it comes to the best time to plant onions, it really depends on where you live. In general, onions are best planted in the spring, after the last frost date. But if you live in a warm climate, you can also plant onions in the fall.

If you’re planting onion seeds, they should be started indoors about 6 weeks before the last frost date. Onion sets, which are small onions that have been grown for one season, can be planted outdoors as soon as the soil can be worked in the spring.



As you can see, onions are versatile vegetables that can be grown in many different ways. Whether you’re a beginner gardener or experienced, we hope this article has taught you something new about onion growing stages and how to grow them successfully. Be sure to visit our blog regularly for more helpful tips on all things gardening.

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