Onion

Bulb onion or Common onion

Allium cepa – Amaryllidaceae

Description

Height – 24 to 36 inches
Spread – 6 to 18 inches
Root Depth – 1 1/2 to 3 feet
Hardiness – Hardy, can tolerate light frost
Exposure – Partial Shade, needs 5 hours of sun per day

Planting

Depth – Sets, 1 inch; seeds, 1/4 to 1/2 inch
Extensive Spacing
  In Row – Spacing between plants within row in inches
  Between Rows – Spacing between rows in inches
Intensive Spacing – 16 per square foot

Direct Seed
  Spring – After last frost
  Fall – n/a

Transplant – Comments
  Spring Inside – From 12 weeks prior to last expected frost to 8 weeks prior to last expected frost
  Spring Outside – From 4 weeks prior to last expected frost to last expected frost
  Fall Inside – n/a
  Fall Outside – n/a

Succession – Plant a second crop four to eights weeks after the first crop

Requirements

Germination – 50°F to 80°F
Growth
  Soil – 60°F to 75°F
  Air – Day, 60°F to 85°F; Night, 55°F to 60°F
pH – 6.0 to 7.5
Watering – Moderate, 1″ per week
Fertilizer – Medium feeder, one main application of fertilizer and supplemental applications once every 4  weeks

Duration

Germination – 4 to 12 days
Maturity – 14 to 20 weeks
Harvest – n/a

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