Planting And Care:

  • Fertilize every few weeks with nitrogen to get big bulbs
  • Cease fertilizing when the onions push the soil away and the bulbing process has started
  • Do not put the soil back around the onions; the bulb needs to emerge above the soil
  • Generally, onions do not need consistent watering if mulch is used
  • About one inch of water per week (including rain water) is sufficient
  • If you want sweeter onions, water more
  • Onions will look healthy even if they are bone dry, be sure to water during drought conditions
  • Make sure soil is well-drained
  • Mulch will help retain moisture and stifle weeds
  • Cut or pull any onions that send up flower stalks; this means that the onions have “bolted” and are done

Onion Improved Care:

  • Select a location with full sun where your onions won’t be shaded by other plants
  • Soil needs to be well-drained, loose, and rich in nitrogen; compact soil affects bulb development
  • Till in aged manure or fertilizer the fall before planting
  • Onions are heavy feeders and need constant nourishment to produce big bulbs
  • At planting time, you can mix in some nitogen fertilizer, too, and side dress every few weeks until the bulbing process begins
  • Seeding? Onion seeds are short-lived
  • If planting seeds indoors, start with fresh seeds each year
  • Start seeds indoors about 6 weeks before transplanting
  • Plant onions as soon as the ground can be worked in the spring, usually late March or April
  • Make sure temperature doesn’t go below 20 degrees F
  • For sets or transplants, plant the smaller sets 1 inch deep, with 4 to 5 inches between each plant and in rows 12 to 18 inches apart
  • Think of onions as a leaf crop, not a root crop
  • When planting onion sets, don’t bury them more than one inch under the soil; if more than the bottom third of the bulb is underground, bulb growth can be restricted

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