In a perennial garden, Egyptian walking onions are a crop that keeps giving, and sometimes keeps moving. Their unusual stalks carry small clusters of bulbils instead of typical onion flowers. When the stalks bend and the bulbils reach the soil, new plants can take root nearby. It’s a charming trick of nature, though one worth planning for if you prefer your onions to stay in their row.
Also called walking onions, tree onions, or topset onions, these hardy alliums can provide greens, bulbils, and small underground bulbs. Here’s how to plant them, encourage a healthy perennial patch, harvest thoughtfully, and keep their wandering habit under control.
1. What are Egyptian walking onions?
Egyptian walking onions are a perennial allium generally identified as Allium × proliferum, a hybrid of common onion and Welsh onion. They’re also sometimes listed as Allium cepa var. proliferum. Rather than producing ordinary flowers and seed, they form clusters of small bulbs called topsets or bulbils at the ends of their stalks.
As the bulbils mature, their weight pulls the stalk down. If a cluster touches the soil, some bulbils may root and grow into new plants. In time, the patch can spread a foot or more from its original position. The “walking” is a gradual series of short steps, not an overnight stroll.
Walking onions suit gardeners looking for a low-fuss perennial allium that can supply more than one kind of harvest. For a wider look at crops that return year after year, visit our guide to perennial vegetables for a lasting garden. For another perennial allium with a different growth habit, see how to grow chives.
2. Choose a planting spot and prepare the soil
Choose a spot with full sun and well-drained soil. Walking onions are adaptable, but they won’t thrive in ground that stays waterlogged. Work compost into poor soil before planting, and remove perennial weeds that would be difficult to tackle once the clump is established.
Allow room for the plants to expand, or put them in a dedicated bed or garden edge where a little wandering won’t surprise you. You can also grow them in a large container with drainage holes, though a container will need regular moisture checks and may need extra winter protection in cold climates.
Onion companion-planting advice can help you think through bed layout and neighboring crops; explore our guide to planning onion companions in the vegetable garden. As with any planting plan, give your onions enough light and room to grow.
3. Plant bulbils or divide an established clump
You can start a patch from bulbils or from divisions of underground bulbs. Plant bulbils in fall or early spring, as soon as you have planting material and the soil is workable. Set each one point-up, about 1 to 2 inches deep, with several inches between plants. Spacing of roughly 4 to 6 inches is a practical starting point; leave more room if you want larger, less crowded clumps.
To divide an established plant, gently lift a crowded clump and separate the underground bulbs, keeping roots attached where possible. Replant the divisions promptly at a similar depth and water them in. Spring or fall are both suitable times, provided conditions aren’t too hot or dry.
Water new plantings to settle the soil, then keep the bed reasonably moist while they establish. Avoid overwatering: the goal is steady growth, not soggy ground.
4. Give the perennial patch simple, steady care
Walking onions are hardy perennials in much of the United States, roughly USDA Zones 3 through 9, though performance depends on local conditions and the particular site. In colder areas, a light layer of straw or other loose mulch can help buffer winter temperature swings. Remove or thin it as spring growth begins.
Established plants are generally straightforward to care for. Weed around young shoots, water during prolonged dry spells, and add a modest layer of compost when growth resumes in spring. Divide mature clumps every few years if the center becomes congested, growth weakens, or you want to share planting material.
5. Understand the “walking” habit, and manage it
The topsets are both the plant’s signature and its main way of spreading. Once a stalk bends, bulbils that reach moist soil may root and establish new clumps. Over several seasons, a patch can gradually migrate into neighboring space.
Want to encourage natural spread? Leave selected stalks in place and let some topsets touch down. Prefer a tidier row? Harvest the topsets before they reach the soil, or remove any unwanted rooted bulbils while they’re small. You can also grow the onions in a dedicated bed or container. Keep a close eye on the edges: a wandering patch is easier to guide early than to reclaim later.
6. Harvest greens, topsets, and underground bulbs
A walking onion patch offers three different harvests. Take only what you need, especially while plants are getting established, so the clump has energy to return.
- Green leaves: Cut a few leaves near the base and leave plenty of healthy growth behind. Use them fresh as you would other green onions. Harvest lightly from young plants; established clumps can handle regular, moderate cutting.
- Topsets: Pick clusters once the bulbils have formed and are well developed. Use them in cooking like small, strongly flavored onions, pickle them, or save them for planting. Leave some on the plant if you want the patch to spread.
- Underground bulbs: Dig these when you want a stronger-flavored onion for the kitchen or divisions for a new planting. Loosen the soil gently rather than pulling hard on the stalks. Remember that digging a bulb removes that plant from the clump.
Walking onion bulbs are not typically cured and stored like dry storage onions. If you’re also growing annual bulb onions, their signs of maturity and curing needs are different; our guide explains when annual onions are ready to harvest and how to cure them.
7. Let the patch rest and return
Once cold weather arrives, the foliage may die back or become less noticeable. Leave the underground bulbs in place; they can send up new shoots when the season turns. In especially cold or exposed gardens, a loose mulch can help protect the bed. Avoid covering the area so heavily that it stays wet.
If you’re saving bulbils, keep them in a cool, dry spot and plant them in fall or early spring. Check them before planting and use firm, healthy ones. As with any perennial crop, local climate, soil drainage, and winter conditions affect how well plants return, so observe your own patch and adjust protection as needed.
A small patch with a long life
Egyptian walking onions turn a simple perennial bed into a little cycle of planting and harvest: green leaves in season, topsets for the kitchen or next planting, and underground bulbs when you want to thin or divide. Give them sun, drainage, and space to spread, or choose a container or dedicated bed if you want to keep them contained.
Start with a few bulbils, watch where the stalks settle, and harvest in moderation while the patch establishes. With a little attention, these unusual alliums can become a dependable part of your garden for seasons to come.
For additional growing details, see University of Wisconsin Horticulture’s guide to Egyptian walking onions and the North Carolina Extension Gardener Plant Toolbox entry.