Zone 10 · Alliums Growing Guide

When to Plant Spring Onion / Scallion
in Zone 10

Bunching onions harvested before they bulb up. Much easier than bulb onions — no day-length concerns, just direct sow and harvest in 60–80 days. Succession sow for year-round supply.

Plant outdoors
Sep – Mar
Start indoors
Direct sow
Last Frost
~Jan 15
Days to harvest
60–80 days
Difficulty
Easy
Ready to harvest — Zone 10
Harvest window: Oct – May

Planting Calendar

In Zone 10, Spring Onion / Scallion should be planted outdoors Sep – Mar, after the average last frost date of approximately Jan 15.

Cool season focus but wider window than most alliums.

Care Guide

Sunlight
Full sun to partial shade · 4–8 hrs/day
Watering
Regular
Spacing
1–2 inches
Soil
Loose, well-draining, fertile
Days to maturity
60–80 days
Soil pH
6.0–7.0
plant tip · Zone 10

Cool season focus but wider window than most alliums.

Feeding Schedule

How often
every 3 weeks
Feed type
balanced (10-10-10)
Key timing
throughout growing season

Light, consistent feeding produces tender green tops. Liquid feed every 3 weeks.

Succession Planting

Sow every 2 weeks

Sow every 2 weeks from early spring through summer. Spring onions are quick (60–80 days) and one of the best succession crops — a small row every 2 weeks keeps them coming all season.

Companion Planting for Spring Onion / Scallion

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

Grows well with
  • Carrots
  • Brassicas
  • Tomatoes
  • Beets
Keep away from
  • Beans
  • Peas
  • Asparagus

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Common questions

In Zone 10, spring onion / scallion is a fall-planted crop. Plant outdoors Sep – Mar once temperatures cool in autumn. It overwinters and is ready to harvest around Oct – May. 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 spring onion / scallion include Carrots, Brassicas, Tomatoes, Beets. Avoid planting near Beans, Peas, Asparagus, which can compete for nutrients or attract pests.
Spring Onion / Scallion typically takes 60–80 days from transplant or direct sow to harvest in Zone 10. Expected harvest window: Oct – May.

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Spring Onion / Scallion in other zones
Crop Guides