Babington's Leek (Allium ampeloprasum var. babingtonii)
4 sources cited · Verified
The short answer
- Plant
- Mid August to mid October
- Site
- 6+ hours of sun, soil pH 5.2–8.3
- Biggest risk
- Allium white rot
In the UK, babington's leeks go in the ground mid August to mid October.
Babington's leeks (Allium ampeloprasum var. babingtonii) — herbaceous perennial.
Timing is the decision that matters most in the UK: there are 4 separate regional sowing windows, ranging from mid August in Southern England to mid August in Scotland.
Core growing advice on this page is checked against named horticultural and university-extension sources — see References.
Regional Planting Calendar
| Region | Sow |
|---|---|
| Southern England | mid August to mid October |
| Midlands | mid August to mid October |
| Northern England | mid August to mid October |
| Scotland | mid August to mid October |
Southern England - detail & sources
Neither source gives region-specific UK planting dates. Bulb offsets are divided and replanted in late summer/early autumn (tier 2 source); RHS confirms H6 hardiness with no frost risk to the dormant bulb, so one UK-wide autumn window is used across all four sub-regions rather than an invented gradient.
Midlands - detail & sources
Neither source gives region-specific UK planting dates. Bulb offsets are divided and replanted in late summer/early autumn (tier 2 source); RHS confirms H6 hardiness with no frost risk to the dormant bulb, so one UK-wide autumn window is used across all four sub-regions rather than an invented gradient.
Northern England - detail & sources
Neither source gives region-specific UK planting dates. Bulb offsets are divided and replanted in late summer/early autumn (tier 2 source); RHS confirms H6 hardiness with no frost risk to the dormant bulb, so one UK-wide autumn window is used across all four sub-regions rather than an invented gradient.
Scotland - detail & sources
Neither source gives region-specific UK planting dates. Bulb offsets are divided and replanted in late summer/early autumn (tier 2 source); RHS confirms H6 hardiness with no frost risk to the dormant bulb, so one UK-wide autumn window is used across all four sub-regions rather than an invented gradient.
Quick Facts
| Factor | Value |
|---|---|
| Soil pH | 5.2 - 8.3 |
| Sunlight | 6-6 hours direct sun |
| Drainage | Well-drained; container growing recommended on heavy clay prone to winter waterlogging (RHS) |
| Lifecycle | herbaceous perennial |
| Edible parts | bulbs, leaves, bulbils, flowers |
At a Glance
Soil & Growing Conditions
Soil pH range
Span reflects genuine variation between the cited authorities, not a single agreed figure.
Growth Stages
| Stage | BBCH | Notes |
|---|---|---|
| Planting | 0 | Propagate by seed, by bulb offsets, or from bulbils. Plant bulbs fairly deeply (tier 2) in full sun, in well-drained chalk, loam or sand -- container growing is recommended where garden soil is heavy clay prone to winter waterlogging. RHS. |
| Establishment | 3 | RHS: takes one to two years to reach maturity as a vegetable -- considerably longer than an annual leek, since this is a true perennial building up a permanent clump rather than a single crop grown to size in one season. |
| Flowering & bulbil production | 6 | Densely packed spherical heads of pale purple-pink flowers appear in mid and late summer (RHS). The flowerhead also produces bulbils abundantly (tier 2) -- small aerial offsets that can themselves be harvested or replanted. |
| Harvest & division | 8 | Leaves and side shoots can be cut for use once established. Bulbils are harvested in late summer once flowering finishes, eaten fresh or planted directly or potted for spring planting (tier 2). Divide bulb offsets in late summer/early autumn and replant bulblets immediately (tier 2) to keep the clump productive. |
Harvest & Storage
When to pick: Leaves and side shoots can be cut once the plant is established. Bulbils form abundantly at the flowerhead and are harvested in late summer once the flowers have finished (Useful Temperate Plants, tier 2) -- either eaten fresh or planted directly to propagate. RHS: takes one to two years from planting to reach maturity as a vegetable.
Diseases
Pests
Babington's Leek, Seedling to Bulbil
References
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Tier 1. Deciduous bulbous perennial, strap-shaped mid-green leaves, densely packed spherical heads of pale purple-pink flowers in mid-late summer. Height 1.5-2.5m, spread 0.1-0.5m. RHS hardiness H6 (-20 to -15C, survives throughout the UK and northern Europe). Full sun; chalk, loam or sand, moist-but-well-drained or well-drained, tolerates acid/alkaline/neutral soil. Container growing recommended where garden soil is heavy clay prone to winter waterlogging. Takes 1-2 years to reach maturity; grown as ornamental or annual vegetable. Propagate by seed or bulb offsets. Not officially native to Great Britain or Ireland, though wild populations occur only there and in the Channel Islands.
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Tier 2 -- a compiled plant-use reference, not a university or government body. Used only for detail RHS does not cover: 6-9 leaves 10-30cm long around a flowering scape, bulbs planted fairly deeply. Bulbs, leaves, bulbils and flowers all edible with a mild garlic/leek flavour; bulbils produced abundantly, harvested late summer, planted directly or potted for spring planting. Bulb division in late summer/early autumn, bulblets replanted immediately.
4 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.
Frequently Asked Questions
When should I sow babington's leeks in the UK?
In Southern England, from mid August. In Scotland, wait until mid August. Treat these as a guide rather than a fixed date — the governing rule is to sow only once frost risk has passed and temperatures are reliably warm enough.
When do I sow babington's leeks?
Sow mid August to mid October.
What soil pH do babington's leeks need?
A pH of about 5.2–8.3. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.
What problems affect babington's leeks?
Our data links 1 disease and 1 pest to this crop. See the sections above for each one and how to manage it.
Plan next season before the problems start
Most of the advice on this page comes down to timing and spacing — sowing at the right moment, rotating beds, and giving plants enough airflow. The UK Garden Planner lays your plot out month by month so those decisions are already made before the season starts.
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Last verified 2026-08-28
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