Allium sphaerocephalon
Roundhead leek, Round-headed allium
Allium Allium
A. sphaerocephalon - A. sphaerocephalon is a bulbous perennial with strap-like, mid-green basal leaves and tall stems bearing small round or oval pink to purple-red flowerheads in summer
Allium sphaerocephalon is: Deciduous
Erect, Spreading
RHS AGM (Award of Garden Merit)
Pink, Reddish-purple in Summer
Mid-green in Spring; Mid-green in Summer
Downy mildew , Onion rot Downy mildew , Onion rot
Division, Seed
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Allium sphaerocephalon (Roundhead leek) will reach a height of 0.9m and a spread of 0.1m after 2-5 years.
Architectural, Beds and borders, Cottage/Informal, Flower Arranging, Gravel, Underplanting
Grows in fertile, well-drained soil. Add grit to clay soils to improve drainage.
Chalky, Clay, Loamy, Sandy (will tolerate most soil types)
Moist but well-drained, Well-drained
Acid, Alkaline, Neutral
Full Sun
North, South, East, West
Sheltered
Hardy (H4)
Allium sphaerocephalon
Roundhead leek, Round-headed allium
Allium Allium
A. sphaerocephalon - A. sphaerocephalon is a bulbous perennial with strap-like, mid-green basal leaves and tall stems bearing small round or oval pink to purple-red flowerheads in summer
Deciduous
Erect, Spreading
RHS AGM (Award of Garden Merit)
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Pink, Reddish-purple in Summer
Mid-green in Spring; Mid-green in Summer
Division, Seed
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Allium sphaerocephalon (Roundhead leek) will reach a height of 0.9m and a spread of 0.1m after 2-5 years.
Architectural, Beds and borders, Cottage/Informal, Flower Arranging, Gravel, Underplanting
Grows in fertile, well-drained soil. Add grit to clay soils to improve drainage.
Chalky, Clay, Loamy, Sandy (will tolerate most soil types)
Moist but well-drained, Well-drained
Acid, Alkaline, Neutral
Full Sun
North, South, East, West
Sheltered
Hardy (H4)
Zone 9, Zone 8, Zone 7, Zone 6
Allium sphaerocephalon (Roundhead leek)
allium leaf miner
Phytomyza gymnostoma
Insect
Present (Limited)
3
3
Pest of Allium already present in UK and spreading; previous consultation supported awareness raising only; industry should prepare for the event of findings in commercial crops.
Allium sphaerocephalon (Roundhead leek)
Asain cotton leafworm; Cluster caterpillar; Fall armyworm; Rice cutworm; Taro caterpiller; Tobacco budworm; Tobacco caterpillar; Tobacco cutworm; Tobacco leaf caterpillar
Spodoptera litura
Insect
Absent
3
3
Regulated pest; frequently intercepted with occasional outbreaks which have been successfully eradicated in the UK.
Allium sphaerocephalon (Roundhead leek)
Nematode; common spiral; Spiral nematode; Steiners spiral nematode
Helicotylenchus dihystera
Nematode
Absent
2
3
Nematode pest unlikely to be very damaging in its own right; but used as a an indicator species to assess compliance of soil requirements of imported plants to be kept under review in light of EFSA evaluation of soil requirements.
Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.
Traveling or importing plants? Please read "Don't risk it" advice here
Suspected outbreak? Click here for contact details to report to the relevant authority.
Date updated: 7th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/
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This plant likes... | Garden match | |
Soil types: | Chalky, Clay, Loamy, Sandy (will tolerate most soil types) | Tell us... |
Soil drainage: | Moist but well-drained, Well-drained | Tell us... |
Soil pH: | Acid, Alkaline, Neutral | Tell us... |
Light: | Full Sun | Tell us... |
Aspect: | North, South, East, West | Tell us... |
Exposure: | Sheltered | Tell us... |
Hardiness: | Hardy (H4) | Tell us... |
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