Onion Plants

Short-Day Onion Plants

  • Short Day Onions start bulbing process when daylength reaches 10-12 hours
  • They mature in 110 days when planted in the south during winter or early spring
  • Short Day Onions mature in 75 days when planted in northern states in late spring but will not get very large; they will not reach their full size potential.
  • The earlier you plant short day onions, the larger they get
  • Short Day Onions are best suited for latitudes of 25-35

Intermediate-Day Onion Plants

  • Intermediate Day or Day Neutral Onions start bulbing process when daylength reaches 12-14 hours
  • Will produce nice-sized bulbs unless you live in far south Florida or south Texas
  • Intermediate Day Onions mature in 110 days when planted at the proper time
  • These are exceptionally sweet
  • Intermediate Day Onions are best suited for latitudes of 32-42

Long-Day Onion Plants

  • Long Day Onions start bulbing process when daylength reaches 14-16 hours
  • These do extremely well in northern states
  • Sweet, storage, and specialty Long Day varieties available
  • Long Day Onions have excellent for long storage
  • Long Day Onions are best suited for latitudes of 37-47

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