• slide
  • slide
  • slide
  • slide
  • slide
  • slide
  • slide
  • slide
  • slide

Onion

Botanical Name
Allium cepa var. cepa
Hardiness
Annual
Height
1 to 3 feet
Width
6 to 12 inches
Flowers
Mid summer: usually doesn't flower unless stressed or grown from sets that are too large
Fruit
Yellow, white, or red
Light
Full sun
Soil
Moist, well-drained, rich
Planting & Care
  • Can be direct seeded in the garden if grown for harvesting as scallions
  • Begin sowing when the soil temperature reaches 50°F. Plant seeds 1/4 deep and space 1/2 apart. Thin to 1/2 to 1 inch spacing.
  • Can be started from seed indoors 8 to 10 weeks before last frost date. Sow seeds 1/4 deep and 1/2 apart. Harden off and set out in the garden 2 to 4 weeks before last frost date.
  • Space transplants 4 inches apart for large bulbs, 2 inches for small bulbs and 1/2 to 1 inch if harvesting as scallions. Space rows 12 to 18 inches apart.
  • Transplant sets (young bulbs about 1/2 inch in diameter) 1 inch deep 2 to 4 weeks before last frost date. Space sets 4 inches apart for large bulbs, 2 inches for small bulbs and 1/2 to 1 inch if harvesting as scallions.
  • To develop long white stems on scallions, hill the soil around the onions when they grow to 4 inches tall
  • Onions require consistent moisture and good weed control
  • Mulch to suppress weeds and retain soil moisture
Problems
Onion maggot, thrips, botrytis blight
Varieties
  • Stuttgarter - yellow
  • Ebenezer - yellow
  • Vidalia
  • Barletta - white, mild flavor, slightly flattened bulb, 65-70 days to maturity
  • Cipollotto da Mazzi - scallion type with long white stock
  • Super Star - sweet white, day-length neutral, All-America Selections winner

Related Content

Upcoming Webinars & Appearances


Feb. 4, 2023
WCBA's Home Building &
Remodeling EXPO

West Bend, WI
 

Feb. 10-12, 2023
PBS Wisconsin
Garden & Landscape EXPO

Madison, WI

June 3 – 11, 2023
“Castles & Gardens” Adventure in Ireland with Melinda Myers
Includes the Bloom Festival in Dublin!

CLICK HERE for more information on Melinda's 2022 Wisconsin State Fair presentations on
Affordable Food Gardening 

CLICK HERE for pollinator gardening webinars, videos & DIY projects

Watch Melinda's past webinars ON DEMAND

Learn More

Book an Appearance

Learn More

Enter to Win
Melinda's Food Gardening for Everyone DVD set!

ENTER NOW