Leeks Carentan Seeds

Grow Carentan leeks for sturdy pale shafts, broad dark-green leaves and a mild allium flavour that suits soups, stews, quiches and roasting.

Ready to grow thick, tender leeks for your kitchen? Follow our step-by-step Leeks Grow Guide for shallow sowing, patient germination, transplanting, regional timing and ongoing care.

Quick Grow Facts

• Plant Type: Cool-season vegetable
• Scientific Name: Allium porrum, often treated within Allium ampeloprasum
• Cultivar: Carentan; the packet does not identify a Giant, Monstrueux, Carentan 2 or Carentan 3 sub-line
• Seed Form: Raw, unpelleted seed; raw does not confirm untreated status
• Pretreatment: None normally required
• General Sowing Time: Cool-season windows vary by region; autumn is the most dependable starting point in many South African gardens
• Position: Full sun; light afternoon shade is useful in very hot districts
• Sow Depth: 3 mm
• Germination: 14–21 days at 15–25°C; aim near 18–22°C where practical
• Transplant: Harden and plant out after roughly 6–8 weeks, when seedlings are about 15–20 cm tall and approaching pencil thickness
• Spacing: 15 cm between plants; use 15 × 15 cm in intensive beds or 30–45 cm between rows for easier airflow and blanching
• Growth Form: Upright, non-bulbing biennial normally harvested in its first season; no support or pinching
• Harvest: Baby leeks from about 10–15 mm shaft diameter; full-size leeks around 20–30 mm. The packet’s 70–130-day range has no declared start point, so use size and quality rather than one universal date.

Why Grow Carentan Leeks?

• Broad dark-green leaves surround substantial edible shafts.
• The mild flavour works in both simple and richer savoury dishes.
• Established plants tolerate cool weather and light to moderate frost, although severe cold slows growth.

Growing Notes

• Sow shallowly in a fine, freely drained nursery mix and keep the top 3 mm evenly moist throughout the slow germination period.
• Transplant 15 cm apart into fertile soil. Use dibber holes or a trench only when you want a longer blanched shaft and the bed drains freely.
• Keep moisture steady, weed shallowly and side-dress modestly if active growth becomes pale or slow.
• Watch for thrips, aphids, snails, slugs, rust and allium root rots. Airflow, rotation and morning soil-level watering reduce risk.

Seed Safety

Seed is supplied for sowing, not eating, sprouts, microgreens or feed. “Raw seed” describes the physical form and does not confirm that the lot is untreated. Follow any warning on the delivered packet.

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