Zone 10 · Alliums Growing Guide

When to Plant Leek
in Zone 10

Long-season allium with mild, sweet flavour. Start very early indoors. Blanch by hilling soil up the stems for white shafts.

Plant outdoors
Sep 15 – Jan 15
Start indoors
Direct sow
Last Frost
~Jan 15
Days to harvest
100–120 days
Difficulty
Medium
Late season — Zone 10
Harvest window: Nov – Mar

Planting Calendar

In Zone 10, Leek should be planted outdoors Sep 15 – Jan 15, after the average last frost date of approximately Jan 15.

Cool season crop.

Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
Regular
Spacing
6–9 inches
Soil
Fertile, well-draining, rich
Days to maturity
100–120 days
Soil pH
6.0–7.0
plant tip · Zone 10

Cool season crop.

Feeding Schedule

How often
monthly
Feed type
high nitrogen
Key timing
throughout growing season

Heavy nitrogen feeder for long, thick stems. Feed monthly throughout the season.

Companion Planting for Leek

What you plant next to leek makes a real difference — some plants actively help, others compete or attract pests.

Grows well with
  • Carrots
  • Celery
  • Brassicas
Keep away from
  • Beans
  • Peas

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Common questions

In Zone 10, leek is a fall-planted crop. Plant outdoors Sep 15 – Jan 15 once temperatures cool in autumn. It overwinters and is ready to harvest around Nov – Mar. No last frost consideration — plant before the ground freezes.
Zone 10 has an average last spring frost of approximately Jan 15 and a first fall frost around Dec 31. These dates vary by specific location — use your ZIP code in the plant app for precision based on the nearest NOAA weather station.
Good companion crops for leek include Carrots, Celery, Brassicas. Avoid planting near Beans, Peas, which can compete for nutrients or attract pests.
Leek typically takes 100–120 days from transplant or direct sow to harvest in Zone 10. Expected harvest window: Nov – Mar.

Free app · iOS February 2028

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Leek in other zones
Crop Guides