Tree onion - Allium proliferum
Tree onion - Allium proliferum
Tree onion - Allium proliferum
Tree onion - Allium proliferum
Allium x proliferum
Rocambole Onion, Egyptian Onion
Excellent recovery of the 2 pots that arrived in early November but were kept in the conservatory all winter. They were transplanted in the spring: they are blooming and growing fuller.
Manoëlle, 29/05/2022
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This plant carries a 6 months recovery warranty
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We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
Description
The 'Rocambole' Onion, also known as the Tree Onion or Egyptian Onion, is a variety that has the peculiarity of producing aerial bulblets. A very hardy perennial plant, the Rocambole Onion can remain in the vegetable garden for several years, making it ideal for permaculture. This ancient vegetable is grown for its shallots and its leaves, which can be consumed like chives. Plant it in spring, from March to May, or in autumn, in September - October.
Native to southern Europe and Egypt, the 'Rocambole' Onion, just like the 'Rocambole' Garlic, is recognised by its aerial bulblets that appear during the summer. Its leaves are long and hollow, with a bluish-green color. The stem has the peculiarity of bearing bulblets grouped in 1 to 2 layers at its top, initially green and then turning coppery red. If the bulblets are not harvested, the stems will dry out in autumn and bend down to the ground, allowing the bulblets to root in the soil. It is a perennial plant and very hardy, capable of remaining in the vegetable garden for several years (approximately 5 years).
In terms of cuisine, the Tree Onion has a similar flavour to shallots. The bulblets can be pickled in vinegar, while the finely chopped leaves add wonderful flavour to omelettes and fresh cheeses.
Harvesting: In summer, cut the stems carrying the aerial bulblets. The foliage is harvested while still green. The aerial bulblets can be harvested for culinary use or to renew the plants.
Storage: The foliage of the Egyptian Onion should be consumed quickly. The bulblets can be stored in a cool and dry place.
Gardener's tip: Plant some Tree Onion, not in the vegetable garden but in the garden as an ornamental plant, to add a touch of originality!
Tree onion - Allium proliferum in pictures
Harvest
Plant habit
Foliage
Planting and care
The 'Rocambole' Onion is cultivated like other Onion varieties. It prefers well-drained soil, light with a sandy tendency and without recent manure (for at least 1 year). Plant it in a sunny location where you haven't grown vegetables from the same family (shallot, garlic, and leek) in recent years. If your soil is very wet, add some sand to it. Planting on mounds will facilitate water drainage and slightly increase the temperature of the soil. Rocambole Onion can be planted in spring, from March to May, or in autumn, in September - October.
Space the rows 25 cm (10in) apart. Loosen the soil. Build up the soil along the entire row to form a mound 10 to 15 cm (4 to 6in) high. Flatten the top. Plant the bulbs every 25 cm (10in) and water lightly.
Hoe and weed, especially at the beginning of cultivation. Mulching is not necessary. Only water in case of drought.
Note: 'Rocambole' Onion is less susceptible to diseases, pests, or excessive moisture than other Onion varieties.
Approximately every 5 years, it is necessary to renew the plants: either by planting harvested bulblets or by dividing the plant.
Cultivation
Care
Intended location
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
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In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.