Short version:
A perennial, easy to grow onion that propagates, without much input from us, via bulbils. All of the plant is edible, but the bulbs and bulbils are small and fiddly so the leaves are great, instead, as a sweeter version of a spring onion. Plant in well-draining, fertile soil in a sunny spot for onion-y greens for most of the year.
The bulbils developing in June
From the moment I read about them I knew I just had to get some. I think that moment was whilst researching the internet for perennial vegetables about 3 years ago. Called Allium proliferum it does indeed have the characteristic smell and taste of sulphurous compounds like other alliums. I’ve also heard that (or read as no-one else I know talks about vegetables at great length) they’re also called tree onions, topset onions and perennial onions. These are all suitable names. They are indeed prolific, grow tall when encouraged, have odd little bulbils at the top and are indeed perennial. My favourite name by far is ‘Egyptian walking onions’. I haven’t been able to figure out if they have their origins in Egypt, but I guess you can say they ‘walk’. It’s not a triffid thing. You won’t see them pull out their roots and go for a wander, cartoon style. What they do instead, is grow mini bulbs, called bulbils, where other alliums grow seeds. When these are ripe the stem dies and falls to the ground. The bulbils will scatter and grow where they have fallen. Of course, I feel the need to do the maths here. If the stem grows to 50cm and we assume that the bulbils fall where the top of the stem ends and this happens once a year, we are looking at:
Bulbils that have made their own way to the soil and are growing.
speed = distance / time
= 500mm / 365.25 (days in a year)
= 1.37mm a day
Divide by 24 hours
= 0.057mm an hour
Divide by 60 minutes
= 0.00095mm a min
Divide by 60 seconds
= 0.000016mm a second
Or in standard scientific terms 1.6×10-8m/s
There is of course nothing scientific about it as there are far too many assumptions but I just like the idea that they could be moving a millimetre or so a day.
Growing
You can order them off the internet as bulbils. You can’t get these from the big commercial providers, but you can usually find then somewhere on the internet from specialised sellers or on ebay. You literally stick them in the ground (or in a pot) in the autumn and by February you’ll see the shoots. Once you have them growing (they can be very slow in the first year) and they’re producing bulbils you can either let them fall as they like, or you can harvest the bulbils to eat or to save for growing elsewhere. If you leave the bulbils on the stem and the stem doesn’t fall, you’ll still find that the bulbils will start shoots and roots anyway. I usually pick them and shove in the soil or in a pot to put on a windowsill over winter to provide a winter supply. If you pick the bulbils when ripe (around September) and stick them straight into the ground you will get shoots in October, but growth will be slow, and the survival of the greens will depend on how mild the winter is. Walking onions are hardy so, come spring you’ll get both the bulbs and the bulbils resprouting fairly early.
Bulbils appearing in June In Nov this stem has died but the bulbs didn’t make their way to the soil. A little cluster of bulbils that are sprouting regardless in Nov
In my heavy, soggy clay soil, they’ll grow but they’re not particularly happy. They do better in the raised beds that have plenty of compost added. They can also grow in some shade but prefer plenty of sun.
The growth of the mother plant dying back end of Nov. The stringy growth in my clay soil by Nov of the bulbils planted that were planted in Oct. The growth by Nov of the bulbils planted in pots in Oct and left outside. Same timings, but these have been left in the porch. These plants will be eaten in winter.
Harvesting
The bulbs are not particularly large in my garden but we don’t eat them anyway. I have no idea why there is a pipe cleaner there. You can see more stems growing from the bulbil cluster. These stems are tender, sweet and tasty at this stage. If left it is possible for more bulbils to grow up there too. You can also see the leaves at the side and these are the bits we eat.
Three-cornered leeks looking very lush in Nov
The leaves are great as spring onions for a long period of the year. They’re sweeter than spring onions are. You can harvest the bulbils for eating when they’re green and therefore have less papery skin. We don’t eat the bulbils. Instead I have been using them in an attempt to populate the whole garden and bits of other people’s gardens with these fabulous plants. If you want to save the bulbils for storing then you need to pick them around September when their skin has become papery. Don’t do what I do and forget to pick them and suddenly find that they’ve all sprouted. In winter, when the walking onions are not doing particularly well, this gap is filled by the three-cornered leek. This is another perennial allium, but it is one that is considered invasive in this country. When lacking in walking onions I’m more than happy to eat the three-cornered leeks into submission.
Eating
All the plant can be eaten but the bulbs are fairly small and fiddly, and the bulbils are tiny and very fiddly. Also, if you eat the bulbs then they’re not going to be perennial. We have always just used the shoots. They’re excellent raw and in salads and are not too hot. Frying increases the sweetness and the flavour becomes very mild. They’re great in kimchi. Once we are able to grow patches of it I suspect we’ll happily fry them as a green.
Used raw with shredded nasturtium and sorrel leaves in crispy duck pancakes. Fried in just a little oil with other veggies and the flowers of the three-cornered leek (middle) to compare taste. Added into garden kimchi as a substitute for spring onions.
They make such an interesting vegetable, they’re perennial, they look after themselves and they’re tasty. This is something that will have a permanent place in our garden and any gardens we may have in the future.
VERY informative! A good post.
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Thank you. That’s kind to say. I assume you read it because you have some/want some. Hope you enjoy growing them (and eating them) as much as we do!
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