Leek
Allium ampeloprasum
About it
- Kind
- Vegetables · Annual
- Family
- Amaryllidaceae
- Hardiness zones
- Zones 3–10
- Sun
- Full sun
- Spacing
- 6 in apart, rows 12 in
- Soil depth in a pot
- At least 12 in
- Soil pH
- 6–7.5
- Water
- About every 4 days
When to plant
- Start indoors
- 12 weeks before planting out
- Plant out
- Plant out 4 weeks before the last frost
- Soil temperature
- Germinates from 40°F
- Ready
- About 120 days from sowing
Based on your last frost date. Outside the US, check local advice.
Varieties people grow
- American Flag— old autumn leek; also sold as Broad London
- Blue Solaise— French heirloom with blue leaves; very cold hardy
- King Richard— long pale summer leek; not for overwintering
- Lancelot— autumn leek with a short, thick shaft
Planting partners
No cited companion planting notes for Leek yet.
Safety for pets and children
- Cats No information in our sources
- Dogs No information in our sources
- Horses No information in our sources
- Children No information in our sources
"No information" means our sources do not say, not that the plant is harmless. A non-toxic listing is not a reason to let anyone eat a plant.
Pests and diseases
No pest or disease notes for Leek yet.
Check the label and your local extension service before using any product.
Where this comes from
- family npgsweb.ars-grin.gov ↗ GRIN page: Allium ampeloprasum L.
- maturity counted from cmg.extension.colostate.edu ↗ Row's 120 days (UMN) is NC State (North Carolina) Table 16-4's S=120-150, not T=50-80; CSU #720 (Colorado) leeks 120 unmarked
- maturity counted from NC State Extension ↗ Row's 120 days (UMN) is NC State (North Carolina) Table 16-4's S=120-150, not T=50-80; CSU #720 (Colorado) leeks 120 unmarked
- min soil temp f cmg.extension.colostate.edu ↗ CSU #720 (Colorado) Table 1: leeks germination minimum 40°F
- Most facts UMN Extension ↗ Backfilled by 0041. Pre-0041 rows recorded one source for the whole row; per-field attribution was never captured and is not invented here.
- transplant weeks rel last frost extension.unh.edu ↗ UNH (New Hampshire) table: leek 4 weeks before last frost (a single week, so no window)