Zone 7 · Alliums Growing Guide

When to Plant Leek
in Zone 7

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

Plant outdoors
Mar 1 – Apr 1
Start indoors
Dec 15 – Jan 5
Last Frost
~Mar 15
Days to harvest
100–120 days
Difficulty
Medium
Growing — Zone 7
Harvest window: Jul – Jan

Planting Calendar

In Zone 7, Leek should be planted outdoors Mar 1 – Apr 1, after the average last frost date of approximately Mar 15. Start seeds indoors around Dec 15 – Jan 5 for a head start.

Long harvest window. In-ground storage through winter.

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 7

Long harvest window. In-ground storage through winter.

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 7, start leek seeds indoors around Dec 15 – Jan 5, then transplant outdoors Mar 1 – Apr 1 after your last frost around Mar 15. Long harvest window. In-ground storage through winter.
Zone 7 has an average last spring frost of approximately Mar 15 and a first fall frost around Nov 15. 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 7. Expected harvest window: Jul – Jan.

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Leek in other zones
Crop Guides