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Growing onions Guide 
A Quick Overview

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Growing onions quick reference guide

Growing onions Guide

The growing onions quick reference guide below is designed as a quick overview of growing onions. For more details on the different stages from seed to harvest go to the related pages link.


Quick Reference Guide

Veggie Garden Dairy
Vegetable Onions
Also Known As
Botanical Family - Alliaceae, Genus - Allium, Species - A. cepa
Plant Type Cool season - biennial - root vegetable
Frost Tolerance Hardy
Planting Position Sunny - Will tolerate some shade throughout growing season - requires a minimum of 4-6 hours of direct sunlight daily.
Seed Viability 1 year
Germination 10-14 days at 40-80 F (4-27 C)
Growing Temp 50-70 F (10-21 C)
Seed to Transplant 8-10 weeks
Planting Method Direct sow seed - seedling transplants - onion sets
When to Plant Fall or Spring
Time to Plant As soon as 2 - 4 weeks before the average date of the last 32 F (0 C) freeze in the spring in your area but not before soil temperatures are consistently 40 F (4 C) and above.
Seed Sowing Direct sowing onion seeds - 1/2 inch (12 mm) deep - 1 inch (25 mm) apart in rows 10 inches (25 cm) apart - thin to 4 inches (10 cm) apart in row
Plant Spacing Plant onion sets and transplants - 1 inch (25 mm) deep - 4 inches (10 cm) apart in rows 10 inches (25 cm) apart.
Soil Conditions Well drained - Low to moderate organic matter - Medium fertility
Fertilizer Medium fertilizer needs, 3-4 quarts per 100 sq feet (3.3-4.4 liters per 9.3 square meters) preplanting of all purpose organic fertilizer 5-5-5, same rate for each side dressing.
When to Fertilize 2 weeks before sowing or transplanting - side-dress when the bulbs begin to swell
Days to Harvest 100-120 days - depending on conditions and variety

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