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Growing onions Guide 
A Quick Overview

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.

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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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Related Pages

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