Carentan

Leek

120d to harvest

Sweet, mellow Carentan leeks unfurl with a tender, buttery bite and a clean, grassy-sweet aroma that feels instantly refined. At maturity, the long, cylindrical stalks form a tightly layered, deep-green outer jacket over a pale, creamy-to-warm ivory center, with a crisp yet yielding texture that holds its character beautifully. Grow Carentan for comforting soups and braises, as well as elegant fresh slices and savory gratins—ideal when you want flavor that’s gentle, not sharp.

Crop Dates

Growing note: In frost-free Zone 10a, grow this cool-season crop during the cooler dry season (October–February).

Milestone	Date
Start Indoors	—
Climate	Frost-Free Climate
Transplant / Sow Outdoors	Oct 1st
Harvest Begins	Jan 29th
Harvest Ends	Feb 28th

Crop Details

Trait	Value
Days to Maturity	120
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	45
Min Night Temp (°F)	35
Harden Off (days)	6

Frequently Asked Questions

What pest or disease commonly affects leeks (Allium porrum), and how do I manage it?

Leeks are commonly hit by leek rust (Puccinia porri) and sometimes leek moth/caterpillars. For rust, remove infected leaves and improve airflow by spacing plants; avoid overhead watering and use a copper-based fungicide if disease is spreading early. For leek moth, inspect leaves for tunnels and frass and apply a row cover immediately after planting to prevent egg-laying, then remove damaged tissue.

How often should I water leeks during the main growing phase (around weeks 6–16)?

Keep the soil consistently moist but not waterlogged—aim for even moisture during the rapid leaf and thickening growth. Water when the top 1 inch of soil begins to dry, typically about 1–2 times per week depending on heat and mulch, and ensure water reaches down around the base for good white-stem development.

How can I tell when my leeks (Allium porrum) are ready to harvest?

Harvest at about 120 days when the plants have a firm, thick white-to-light-green stem and the leaves are still relatively upright rather than collapsing. Use a gentle twist-and-lift to test firmness; if the lower stalk feels crisp and substantial, it’s ready. For the best flavor, harvest before severe frost when possible, but you can leave them in the ground for a period with protection in colder weather.