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Egyptian Walking Onion
A perennial onion that plants itself: instead of flowers it grows a cluster of little bulbs on top of the stalk, which tips over and roots where it lands. The earliest green onion of the year and close to indestructible.
Safe for people - the greens, the topsets and the underground bulbs are all edible, and all of them are more pungent than a supermarket onion. Like every allium, toxic to dogs and cats in quantity.
Overview
The one thing to knowIn their place, the top of each hollow stalk swells into a knot of marble-sized bulbs called topsets.
The Egyptian walking onion is the nearest thing a vegetable garden has to a self-running machine. It is a hardy perennial hybrid (Allium × proliferum, a cross between the common onion and the bunching onion) that almost never bothers with flowers. In their place, the top of each hollow stalk swells into a knot of marble-sized bulbs called topsets. As they fatten the stalk goes top-heavy, arches over, and sets them down on the soil, where they root and start a new clump - so the patch takes a step of a foot or two every year. That is the walking, and it is the whole personality of the plant.
One planting gives three different harvests. The hollow green tops are the first fresh thing out of the garden most years, often standing up through the last snow while the rest of the beds are bare. The summer topsets are sharp little onions that pickle beautifully or go straight back into the ground. And the base of each clump holds shallot-like underground bulbs you can dig at will. Nothing about it is Egyptian, and nothing about it is delicate: it is hardy to roughly -30°F, wants no feeding, and survives being ignored for years.
Quick facts
- Life cycle
- Perennial, lives about 15 years
- Height
- 30 in18 to 48
- Spread
- 12 in6 to 18
- Cold
- Takes hard frostdamaged below -30°F
- Heat
- Struggles above 95°F
- Self-sows
- Yes, expect volunteers
Full sun or part sun · medium water · well-drained soil · 8 in apart (6 to 12) · division or bulbs/cloves
When to plant
Fall planting is open for 20 more days.
- Plant tubers Aug 2 – Oct 11 Open now · 20 days leftAbout 12 weeks before to 2 weeks before your first frost (Oct 25 here)Fall planting into ground that stays workable; the clump grows through most of the winter and gives greens in the cool months.
Frost here: last around Apr 10 (Mar 27 to Apr 24 most years), first around Oct 25. Zone averages, your own yard may run a week or two either way.
Life stages
One stage to settle in, then four that repeat each year. Windows are typical; your zone and weather move them.
Rooting in (planting year)
Day 0 to 60 from planting- DoPlant topsets 1-2 inches deep, root end downBreak a topset cluster into single bulbils and set each one 1-2 inches deep, 6-12 inches apart. A tiny bulbil goes shallower, a fat one deeper. Late summer to fall is the ideal window - they root before the ground freezes.
- WaterWater in once, then leave them aloneOne good soaking at planting is enough. Walking onions rot in soggy ground far more easily than they suffer from dryness.
- MulchMulch the first winter in zones 3-4A few inches of straw or shredded leaves stops freeze-thaw heaving on a new planting. Established clumps never need it.
Watch for- Bulbils heaved out of the soil by frost cycles
- Green shoots appearing in fall (normal - they overwinter green in most zones)
Earliest spring greens
Feb to May, every year- HarvestCut greens like scallionsevery 10 daysSnip hollow green tops an inch or two above the base while they are still tender. This is usually the first fresh thing out of the garden all year - often up through late snow.
- FertilizeFeed lightly at green-upOne light nitrogen feed as growth resumes gives thicker, milder greens. Skip it entirely and the plant still performs - this is a want, not a need.
- WeedWeed the patch while you can still see itevery 3 weeksA perennial allium bed collects perennial weeds. Clear them in early spring before the onions close over, and pull rather than hoe so you do not slice the shallow bulbs.
Watch for- Greens toughening as the flower stalk starts up (cut them younger)
- Aphids clustered in the leaf folds
Topsets forming (instead of flowers)
May to Jun, every year- InspectWatch the stalk swell instead of bloomWhere a normal onion opens a globe of flowers, this one grows a knot of little bulbs. Occasionally a few sterile purple florets appear among them - harmless, and no seed comes of it.
- DoDecide now whether to let it walkThe stalk will get top-heavy, arch over and root the topsets wherever they land - about a foot or two a year. Pick the topsets before that happens to keep the clump where you put it, or let it fall and get a free new patch.
Watch for- Stalks leaning as topsets fatten (the countdown to walking)
- A second tier of topsets sprouting on top of the first (normal, and impressive)
Topsets and underground bulbs
Jun to Aug, every year- HarvestSnap off topsets when the skins go papery bronzeCut the whole cluster off with a few inches of stalk once the bulbils are firm, tight and coppery. Keep the biggest ones for replanting and eat or pickle the rest.
- HarvestDig underground bulbs after the tops brown offThe base of each clump holds shallot-sized bulbs. Lift what you want in midsummer once the tops die back, and leave at least one bulb per clump in the ground to carry the patch.
- DoReplant topsets straight away, or store them dryFreshly harvested topsets can go back in the ground immediately for next year's crop, or cure in an airy spot and be planted any time through fall.
Watch for- Clusters shattering and scattering bulbils if you leave them too long
- Congested clumps producing only small bulbs (time to divide)
Winter rest
Nov to Jan, every year- DoDo nothing at allIn cold zones the tops die back and the bulbs sit tight; in zones 7 and warmer the plant often stays green and pickable straight through winter. No protection, no lifting, no fuss.
- HarvestKeep cutting greens in mild zonesWhere the ground does not freeze hard, walking onions are a genuine winter salad crop - snip tops through the cool months when nothing else is growing.
Watch for- Standing water over the clumps (the one thing that kills them)
- Very early regrowth in a mild spell - it shrugs off the refreeze
Harvest
- Green tops 8 inches or more and still soft enough to bend - cut before the stalk hardens
- Topsets firm, tight and coppery-bronze with papery skins, the stalk starting to bend under them
- Underground bulbs lifted after the tops brown off in midsummer
- Snap off topsets when the skins go papery bronze
- Dig underground bulbs after the tops brown off
- Replant topsets straight away, or store them dry
Per plant 10 to 80 topsets, 4 to 32 ozPicking cut and it regrows
Cook with Egyptian Walking Onion
Watch out for
4 to know. 1 is high-risk: White Rot (Allium). None are active in September.
White Rot (Allium)Severity High DiseaseThe one threat that can genuinely end a walking onion patch.
A perennial allium bed is never rotated, which is exactly the condition white rot exploits - and topsets passed hand to hand between gardens are a classic way it travels. Start from a clean source, do not accept bulbs from a bed where alliums have collapsed, and never move soil or bulbs out of an affected patch.
Yellowing, wilting plants that pull up far too easily because the roots have gone, and - on the rotted bulb base - white cottony fungal growth with tiny black poppy-seed-like dots through it.
There is no viable garden treatment. Remove and bin infected plants, never compost them, and do not grow alliums in that soil again. This is why clean planting-stock discipline matters more here than for any other allium problem.
This is entirely about never introducing it. Buy certified disease-free seed stock, sets and plants, never plant grocery-store bulbs or cloves, quarantine new stock, and do not move soil, bulbs or tools between an affected bed and a clean one. Once it is in, it is essentially permanent.
The most serious allium disease there is. A soil fungus (Sclerotium cepivorum) rots the roots and the base of the bulb, growing a white fluffy mold over it studded with tiny black sclerotia like poppy seeds. Those sclerotia survive in the soil for twenty years or more and germinate whenever an allium is planted above them, so a bed that gets it is finished for alliums within a home gardener's timescale. It arrives on infected planting stock and on moved soil.
Onion MaggotSeverity Low PestEstablished clumps mostly shrug this off, and rotation is not an option on a perennial planting - so the practical defense is dividing regularly to keep clumps vigorous and pulling out any individual bulb that wilts and goes soft.
Individual plants yellowing and wilting while their neighbors look fine, and - on pulling one - small white maggots with brown, slimy rot in the bulb base, shank or stem.
There is no rescue for a maggot-riddled bulb. Pull and destroy infested plants rather than composting them, and never save affected bulbs for replanting. Beneficial nematodes drenched into the soil help suppress the larvae in a bed you have to keep using.
Rotate alliums yearly, cover the crop with row fabric through the fly's spring egg-laying window, space plants out rather than growing them in dense rows, and never plant into fresh manure, which draws the flies in.
The larvae of a small gray fly - the onion fly is the same insect - that lays its eggs at the base of allium plants. The white maggots tunnel into the bulb, shank or stem base, and the damage they leave opens the door to soft rot, so the plant yellows, wilts and collapses into a mush. It is worst in cool, wet springs, in unrotated allium beds, and in dense rows where the maggots can work from one plant to the next.
Rust (Allium)Severity Low DiseaseShows up on congested clumps in humid summers, after the best greens are already cut.
Cut the affected leaves off, divide the clump to open it up, and the fresh growth comes back clean.
Orange-red raised dots and streaks on the leaf blades, worst in humid spells and on crowded, poorly spaced or congested plantings.
Strip or shear off the worst-affected leaves early and let clean growth come back, improving airflow at the same time. A bulb crop usually still matures, so harvest on schedule rather than writing it off - rust rarely reaches the bulb itself.
Give wide spacing and full sun so the leaves dry quickly, avoid overhead watering and excess nitrogen, divide congested perennial clumps, and rotate alliums on a three-year cycle. Rust-tolerant varieties are available in some allium crops.
A fungal disease that raises bright orange pustules on allium leaves. The pustules destroy green tissue, and since those leaves are what feed the bulb, a heavy infection shrinks the crop or weakens the clump. It builds in humid weather, in crowded plantings and in high-nitrogen soil, and it rarely reaches the bulb itself.
ThripsSeverity Low PestMostly cosmetic here, and it arrives in midsummer heat when the greens are already past their best.
The spring and fall cuttings - the ones you actually want - are usually clean.
Silvery-white streaks and fine speckling on leaves and petals, brown discolored patches, distorted buds and blooms that fail to open properly, and tiny sliver-like insects that drop out when you shake foliage or a flower over a sheet of white paper. Worst in hot, dry spells and on drought-stressed plants.
A strong water spray dislodges light infestations, and on a plant that can take it a hard shear and clean regrowth clears them outright. For heavier pressure use insecticidal soap, neem or spinosad, aimed down into the leaf sheaths and buds where thrips actually shelter, and repeat at intervals since eggs and pupae escape a single spray. Spinosad is a registered insecticide: use only a product labeled for the crop you are treating, follow the label exactly, and observe its pre-harvest interval.
Scout early, before the damage reaches the part of the plant you care about. Start with clean planting stock, keep plants well watered since drought-stressed plants suffer worst, avoid heavy nitrogen, clear weedy hosts nearby, and hang blue or yellow sticky traps to catch the first arrivals. Reflective mulch deters them, and predatory mites, lacewings and minute pirate bugs do real work outdoors.
Tiny slender sap-sucking insects that rasp at leaves, buds and petals and drink what runs out, leaving silvery-white streaking and fine flecking, brown scorched patches, and new growth that comes out twisted or fails to open. They breed fast in hot, dry weather, shelter deep in leaf sheaths, folds and unopened buds where sprays struggle to reach, and several species also transmit plant viruses - which is often more damaging than the feeding itself.
Good & bad neighbors
Plant nearby
- Traditional pairings, thin evidence
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Alliums are traditionally credited with deterring cabbage moths from brassica beds; a permanent clump at the end of the bed does the job without being dug up each year.
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The classic allium-carrot pairing - onion scent is credited with masking carrots from the carrot rust fly. Bear in mind this is a permanent planting, so it suits a bed edge next to the carrot row rather than the row itself.
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Two perennials that can share ground for years; the allium scent is traditionally credited with discouraging strawberry pests. Keep the walking onions to one end so the runners and the topsets do not tangle.
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A staple of orchard underplanting: a permanent allium at the drip line asks nothing, holds ground against grass, and is traditionally said to deter browsing and some pests. The evidence is thin but the plant genuinely thrives there.
Keep apart
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The same allium-legume conflict, made worse by permanence: a walking onion colony that reaches the bean bed will still be there next season.
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Alliums are widely reported to inhibit legumes and their nitrogen-fixing bacteria - and unlike an annual onion, this one is not going anywhere, so keep it out of ground you use for peas.
Varieties · 3
You pick one when you add Egyptian Walking Onion to your garden. Its days to maturity set your harvest window.
Common Egyptian Walking Onion
Blue-green hollow leaves with a cluster of reddish-bronze marble-sized topsets on a 2-3 ft stalk.
topsettingcold-hardyheirloompungentThe standard walking onion passed hand to hand in gardens: vigorous hollow green tops, coppery-bronze topsets in early summer, and shallot-sized bulbs at the base. Usually sold with no cultivar name at all - most bags of topsets are simply this.
Catawissa
Tall stout stalks to 3-4 ft carrying tiered clusters of topsets, one sprouting above another.
topsettingvigorousdouble-tierheirloomAn old, unusually vigorous strain famous for stacking: its topsets frequently sprout in place and throw a second stalk with a second cluster of topsets on top of the first, sometimes a third. Taller and heavier-cropping than the common strain, and the most entertaining walking onion to grow.
McCullar's White Topset
White-skinned topsets on green stalks, with tender pale-based green tops.
topsettingwhitemilderheirloomA white-skinned Southern heirloom topsetting onion kept alive through seed-saver networks, noticeably gentler in flavor than the common bronze strain and valued for its green tops as much as its topsets. Harder to find, and worth taking if offered.
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