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How Tall Does a Green Onion Plant Grow

Updated: June 14, 2022

Green onions, also known as scallions, are a popular ingredient in many dishes around the world. They are a type of Allium plant, which also includes garlic and shallots. These vegetables are easy to grow and can be planted in the garden or in containers. One of the most common questions that people ask about green onions is how tall they grow. In this article, we will explore the answer to this question and provide some tips on growing green onions.

The Height of Green Onion Plants

Green onion plants can grow up to 2 feet tall, depending on the variety and growing conditions. However, most varieties will typically only reach a height of 12-18 inches. The height of the plant will depend on factors such as soil fertility, temperature, and sunlight exposure.

Green onions are a fast-growing vegetable that can be harvested in just a few weeks after planting. They can be grown from seeds or from small onion bulbs called sets. When planting seeds, it is important to keep them moist until they germinate, which usually takes about 7-10 days. Once the seedlings have emerged, they should be thinned out to prevent overcrowding.

Tips for Growing Green Onions

To ensure that your green onion plants grow to their full potential, there are a few tips that you should follow:

Soil Preparation

Green onions prefer well-draining soil that is rich in organic matter. Before planting your seeds or sets, prepare your soil by adding compost or aged manure. This will provide the nutrients that your plants need to grow strong and healthy.


Green onions require at least six hours of sunlight per day to grow properly. If you are planting them indoors, make sure that they are placed near a sunny window or under artificial lights that mimic natural sunlight.


Green onions require regular watering to keep the soil moist but not waterlogged. Water your plants deeply once or twice a week, depending on the weather conditions. Avoid overhead watering as this can lead to fungal diseases.


Green onions do not require heavy fertilization like other vegetables, but a balanced fertilizer can help them grow stronger and healthier. Apply a granular fertilizer to your soil before planting or use a liquid fertilizer every two weeks during the growing season.


How long does it take for green onions to grow?

Green onions typically take 6-8 weeks to reach maturity from seed and 4-6 weeks from sets.

Can green onions be grown indoors?

Yes, green onions can be grown indoors in containers with good drainage and proper lighting.

Can green onions be grown year-round?

Green onions can be grown year-round in mild climates. In colder climates, they can be grown in the spring and fall.

How do I know when my green onions are ready to harvest?

Green onions are ready to harvest when they reach a diameter of ½ inch or more. The tops should be green and firm, and the bulbs should be white.

In conclusion, green onions are an easy-to-grow vegetable that can add flavor and nutrition to any dish. They grow up to 2 feet tall but typically only reach a height of 12-18 inches. By following the tips provided in this article, you can ensure that your green onion plants grow to their full potential and provide you with a bountiful harvest.