Back to top


Red Onion
Yellow Onion

Onions are a cool-season crop that requires a long growing season to produce high quality bulbs and good yields. Medium to light loam soils with good drainage are best suited for onion production. Onions have limited root systems so irrigation is essential, especially in dry years. Weed control is also critical and difficult, and on most farms is the most limiting factor in onion production. Onions bulb according to day length and only long-day and intermediate-day types are recommended for New England.

For Current information on production methods (including varieties, spacing, seeding, and fertility), weed, disease, and insect management, please visit the New England Vegetable Management Guide website

Major diseases that affect this crop:

Major insect pests that affect this crop:

Also see: Alliums, Post Harvest and Storage Diseases

Last Updated: 
January 2013

The Center for Agriculture, Food and the Environment and UMass Extension are equal opportunity providers and employers, United States Department of Agriculture cooperating. Contact your local Extension office for information on disability accommodations. Contact the State Center Director’s Office if you have concerns related to discrimination, 413-545-4800 or see