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Tree onion: How to Grow, Harvest, Fertilize, and Use Tree onion

Written By: Rob Gardener
Last Updated:

My Journey to Growing Tree Onions

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As a gardener, I'm always excited to try new things and experiment with different varieties of plants. Recently, I decided to give tree onions a shot, and I'm thrilled with how they've turned out. In this article, I'll share my experience of growing tree onions, including the challenges I faced and the tips I learned along the way.

What are Tree Onions?

Tree onions, also known as scallion trees or perennial onions, are a type of vegetable that grows from a bulb similar to regular onions. However, unlike regular onions, tree onions do not form a large, bulbous head. Instead, they produce a long, thin stem with small, edible leaves that can be harvested at any time. Tree onions are a great choice for gardeners who want to grow a low-maintenance, perennial crop that can be harvested multiple times throughout the growing season.

Getting Started

To start growing tree onions, I began by purchasing a few bulbs from a local nursery. I chose a variety that was specifically labeled as "tree onion" or "perennial onion," as these are the types that are most likely to grow well in my climate. I also made sure to choose bulbs that were firm and free of any signs of rot or decay.

Next, I prepared my garden bed by loosening the soil to a depth of about 8-10 inches. I added a 2-inch layer of compost or well-rotted manure to the soil to give it a boost of nutrients. I also made sure to choose a location that received full sun to partial shade, as tree onions prefer well-drained soil and full sun to partial shade.

Planting the Bulbs

Once my garden bed was prepared, I planted the tree onion bulbs about 1-2 inches deep and 4-6 inches apart. I watered the soil well after planting and made sure to keep it consistently moist throughout the growing season.

Caring for the Tree Onions

As the tree onions grew, I made sure to keep the soil consistently moist but not waterlogged. I also fertilized the plants with a balanced fertilizer once a month, which helped to promote healthy growth and flavor.

One of the biggest challenges I faced while growing tree onions was controlling the size of the plants. If left unchecked, the trees can grow quite tall (up to 2 feet) and spread out quite wide (up to 6 feet). To keep the plants under control, I used a combination of staking and pruning. I staked the plants to the ground using a soft tie, which helped to keep them upright and prevent them from becoming too leggy. I also pruned the plants back regularly to encourage bushy growth and prevent them from flowering.

Harvesting the Tree Onions

One of the best things about growing tree onions is the ability to harvest them multiple times throughout the growing season. I typically start harvesting the tree onions when the leaves are about 6-8 inches tall, which is usually around 60-90 days after planting. I use a pair of scissors or a sharp knife to cut the leaves at the base of the stem, leaving a small portion of the stem intact to allow the plant to regrow.

I've been harvesting my tree onions for several months now, and I'm thrilled with the results. The leaves are delicious and add a great flavor to salads, soups, and other dishes. I've also been using the tree onions in a variety of recipes, including stir-fries, sautés, and roasted vegetable dishes.

Tips and Tricks

Here are a few tips and tricks that I've learned while growing tree onions:

Conclusion

Growing tree onions has been a rewarding experience for me, and I'm excited to continue experimenting with different varieties and growing techniques. If you're interested in trying your hand at growing tree onions, I hope the tips and tricks outlined in this article will be helpful. Happy gardening!