Is onion a root?

In this article we will answer the question, “Is onion a root”? and we will discuss how the onion is not considered as a root. This article includes the reasons why onions are technically considered as stems.

Is onion a root?

No, an onion is not a root. Because onions grow underground, they are frequently mistaken for roots. Others believe onions are stems because the plant’s top half is mostly leafy. Is onion a root or a stem?

The root system of the onion is fibrous, yet it is not fully a root. The whole root system of an onion bulb grows from the bulb’s basal section. The stem and leaves make up the rest.

Why are onions referred to as stem?

Technically Yes onions are stem. An onion is a type of subterranean stem structure that has been changed. Onion has been transformed into a distinctive tunicated bulb as a result of the alteration. The real stem is reduced to the bulb’s flat base. The concentric leaf structure connected to the stem makes up the rest of the fleshy part.

The bulged leaf structure at the base of the onion plant stores its processed food. The onion is the bulged structure.

Because it belongs to the modified stems and leaves group, the onion may be considered a stem. Modifications happen when plants strive to adapt to a new environment. They can be found underground, in the air, or on the surface.

Onions, as you can see, do not grow like other plants. The leaves create a tunicated bulb underground, but the main stem is a flat base.

About the onion

The onion is a plant of the genus Allium that is one of the most widely grown. Onion farming stretches back around 7000 years. However, it is unknown when or where it originated.

Onions are distinguished by hollow leaves and a flat base where both roots and fleshy leaves emerge. They are also known as common onions or bulb onions.

An onion’s stem, unlike that of the ginger, is devoid of nodes and internodes. When preparing onions, the flat base is the hard portion at the bottom of the onion that you cut off and discard.

The stem might be considered this foundation. On this stalk, leaves appear one by one, one after the other, forming a concentric circle around a bud in the center. When you chop the onion horizontally or vertically, this cluster of leaves is apparent. The basal point is the only portion that qualifies to be termed a stem, thus it’s also known as a false stem.

Onion Blubbing

This is how the onion bulbs we collect grow and mature. It happens when the leaves that grew from the basal point begin to expand as they collect nourishment.

Day-length, also known as the photo-period, is one of the elements that affect how large the bulbs develop. This means that the larger the bulbs develop, the longer the day is at the right temperatures.

These are some of them:

·         Long day onions require 14 to 16 hours of sunshine to grow.

·         The intermediate day requires 12 to 14 hours of daylight.

·         Short day – Only 10 to 12 hours of daylight are required for this type.

Onions, like any other plant, require photosynthetic leaves to generate leaves since the bulb leaves solely store food. That’s why they have upward-growing leaves and blooms.


Although onions are perennials, they are sometimes cultivated as annuals. And, in most cases, the bulbs are taken before they reach maturity. Allowing the bulbs to develop will cause them to stop feeding the blooms, and you will be unable to pick them.

As a result, if you keep onions for an extended period, they may grow green sprouts. Most components of the onion plant can be eaten, including the bulbs, sprouts, and, in certain varieties, the roots.

Onions may also be used as a natural pesticide. So, if you’re searching for a natural approach to keeping bugs away, onions could be a good option.

Neither Root nor Stem

So, is an onion a stem or a root? Neither is the case. They can, however, be referred to as stems because bulb creation is a sort of modified stem. A modified stem known as a tunicated bulb is the best definition. Tubers, such as those found in potatoes, and rhizomes, such as those found in ginger, are further examples of modified stems. Onions cannot be called fruits since fruits must emerge from blossoms, but onion bulbs develop from the stem and roots, as we’ve seen.


In this article, we answered the question “Is onion a root?” and discussed how the onion is not considered as a root. We have discussed in the article reasons why onions are technically considered as stems.


Hi, I am Charlotte, I love cooking and in my previous life, I was a chef. I bring some of my experience to the recipes on this hub and answer your food questions.