All Onion Seed

Top Keeper Onion

Top Keeper Onion

ON546

275 days. Intermediate-day variety. A top-notch onion whose name speaks for itself! Top Keeper is an overwintering onion that can store through November of the year that it is harvested. Top Keeper is less susceptible to bolting and splitting than other overwintering varieties. The flattened, globe-shaped, brownish yellow bulbs weigh approximately 3/4 pound.

   Hybrid Variety
Approximately 200 seeds per gram.
  • ON546/S
  • 1/2 gram
  • $2.85

  • ON546/P
  • 2 grams
  • $6.55

  • ON546/B
  • 1/2 oz
  • $27.25

  • ON546C1
  • 1 oz
  • $46.65

  • ON546C2
  • 1/4 lb
  • $127.55
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Soil Temp for Germ.Days to EmergenceSeed DepthThin Plants ToSeed SpacingRow SpacingMin. Germ.Seed LifeSeeds per 1/2 gramFertilizer Needs
50-75°F6-161/8-1/2"2-7"2-4/inch12-24"75%1 year≈ 100Medium


Allium cepa

Culture
• Onions are photoperiodic plants — they regulate their stages of growth by day length
• Onions will make top growth until the critical light duration is reached, then bulbing begins
• The amount of growth and development prior to bulbing will determine the bulb size
Long-day varieties do well in northern states where summertime day length is between 14-16 hours
Short-day varieties do well in southern states and bulb when day length is 10-12 hours; they won't get very large in northern states
• Dividing line between short-day and long-day varieties is generally accepted as 36° latitude, roughly along the Kansas/Oklahoma border
Day-neutral and intermediate-day varieties start bulbing when day length is 12-14 hours; can be successfully grown anywhere
• Onions prefer light, sandy, loamy soils
• Apply 1/4-1/2 cup of TSC's Complete fertilizer per 5 row feet, 1-2 inches below transplant or seed

Direct Sowing
• Thin to the strongest plant when 4-5 inches

Transplanting
• Sow up to 10-12 seeds in a 4-6 inch pot
• If tops reach over 5 inches before transplant, cut to 3 inches
• When planting out carefully separate the seedlings and place in a shallow trench
• Fill trench around seedlings and water in well

Insects & Diseases
Common insects: Onion thrips and maggots
Insect control: Neem oil or Predatory Nematodes
Common diseases: Fusarium basal rot, pink root
Disease prevention: 5-7 year crop rotation

Harvest & Storage
• For scallions: harvest when pencil size or larger, wash and trim roots, store in a bag at 36°F and 95% relative humidity
• As bulbs approach maturity, withhold water so protective paper can form
• After about half the tops have fallen, push over the remainder; wait about 1 week then harvest
• Cure in a warm (75-80°F), shaded, well-ventilated location until outer skin and necks are dry, then trim tops, leaving one inch above the bulb
• Store in a cool, dry, well-ventilated area
• Check occasionally and immediately remove any sprouting or rotting onions

What is pelleted seed?
Seed that has been coated with a clay-based material to form a larger, round shape. This makes planting by hand or mechanical seeder easier and allows for more controlled sowing of small seeds such as carrots or lettuce. All pelleted seed has a National Organic Program (NOP) approved coating.