A perennial onion that propagates itself by toppling its bulbil-laden stalks, giving you a self-renewing harvest of greens and small bulbs year after year.
Allium × proliferum · also called Egyptian onion, tree onion
4–6 weeks before first fall frost, so roots establish before the ground freezes.
Once established, walking onions require almost no replanting — the plant does it for you. They produce usable greens from late winter onward, weeks before any annual onion is ready.
A little history. A hybrid between common bulbing onion and Welsh onion, confirmed by chromosome studies. It produces clusters of small bulbils (miniature bulbs) at the top of the flower stalk rather than seeds, which is the primary means of natural spread.
Beds strongly preferred — the plant spreads by toppling and needs room to walk; containers limit this natural cycle. In containers: 5-gallon pot, at least 10 inches deep, for a single clump only. Space plants 6 inches (15 cm) apart.
Water deeply once or twice a week during active growth; reduce once tops die back in summer heat. Water when the top 2 inches of soil feel dry to the touch. Aim for about 1 inch per week including rain.
Side-dress (scatter fertilizer along the row and water in) once in early spring and once after harvest. What to use: balanced compost or a low-phosphorus organic fertilizer such as 3–1-2.
Cut flower stalks back to the base if you want to redirect energy into basal bulbs; leave stalks standing if you want bulbils to drop and propagate new plants.
It's ready when harvest green tops any time they reach 6 inches tall. Harvest basal bulbs when the neck begins to dry and tighten. Harvest top bulbils when the cluster is plump and the skin papery. Snip green tops with scissors, leaving at least 2 inches of growth. Lift basal bulbs with a fork. Twist or cut bulbil clusters from the stalk when skins are dry; replant or store immediately.
Green tops: refrigerate in a damp cloth up to 1 week. Bulbils: cure in a dry, airy spot for 2 weeks, then store in a mesh bag at 50–60 °F (10–16 °C) for up to 4 months.
No succession sowing needed — established clumps produce continuously. Divide crowded clumps every 2–3 years in fall to maintain vigor.
No action needed in most climates — crowns survive in the ground. In areas with prolonged frozen soil, mulch crowns with 3–4 inches of straw after the first hard frost and remove in early spring.
Carrot
The onion smell can help hide young carrots from carrot rust fly, and the carrot foliage muddles the scent trail onion flies follow. Trials show the effect holds mainly under low to moderate pest pressure, so treat it as a bonus rather than a shield.
Beet
Walking onion roots stay shallow and fibrous in the top few inches, while beets send a taproot well below, so the two draw water and food from different layers instead of fighting for the same soil.
Chamomile
Chamomile's small open flowers are easy feeding for hoverflies, lacewings, and tiny parasitic wasps, whose young often reduce thrips numbers on nearby onion foliage. Let a few plants flower at the bed edge rather than cutting them all for tea.
Summer Savory
Gardeners have long set summer savory beside onions, and it is said to keep them thriving. No mechanism has been demonstrated, but the herb is low, quick, and undemanding, so it costs nothing to try along the clump edge.
Lettuce
A skirt of lettuce between onion clumps shades the soil surface, holds moisture around the shallow onion roots, and crowds out weeds that are awkward to pull from an established perennial patch.
Green Bean
Old companion charts keep beans and the onion family apart, and the habit persists in most garden books. No measured mechanism has been found, so if space is tight the pairing is more caution than rule.
Garden Pea
Peas are said to sulk beside onions, a pairing warning that dates back a century with no demonstrated cause. Give them separate rows if you can, but do not expect a visible penalty if they end up neighbours.
Asparagus
Both are permanent beds, and walking onion earns its name by toppling and rooting wherever the bulbil cluster lands. Volunteers push into asparagus crowns, and lifting or weeding them disturbs the shallow spear buds you want left alone.
A perennial — it holds its spot for years, so it sits outside the annual rotation.
Walking onion holds a permanent corner and sits outside the yearly rotation, feeding at a moderate rate and leaving a shallow, low-residue root mat behind. When you finally renovate the patch, follow with brassicas or legumes and keep alliums out of that ground for several years.
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