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High Mowing Organic Seeds
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Organic Non-GMO Onion Seeds::Organic Non-GMO Sweet Onions::Organic Gladstone Onion

Organic Gladstone Onion  Organic Non-GMO Gladstone Onion - OPEN-POLLINATED

A widely-adapted fresh market white onion for growers in the northern and middle regions of the country. Dark green foliage, great for bunching. Medium to large bulbs resist greening and are mildly sweet with very firm flesh. Moderate storage potential; some susceptibility to smudge. From our partners at Bejo Seeds. Intermediate day · 4-5" bulbs (Allium cepa)

Days to maturity: 110 days
SKU Description Our price
2682A 100 Seeds $3.40
2682M001 1 M $5.00
2682M005 5 M $22.50 $4.50/M
2682M025 25 M $108.00 $4.32/M
2682M050 50 M $193.50 $3.87/M
2682M100 100 M $368.00 $3.68/M
2682M500 500 M $1740.00 $3.48/M
2682M1000 1000 M $3330.00 $3.33/M

Unit Size
Sweet Onion Comparison Chart
Item Code Variety Name Heirloom DTM Day Length Color Size Shape Storage Rating Standout Characteristics
2704 Zoey F1   95 intermediate white flesh, pale yellow skin 4" round moderate widely adapted with excellent quality. High yielding, uniform and vigorous with some tolerance to pink root. Sweet, flavorful white flesh
2683 Ailsa Craig 105 long white/light brown skin 5-6" round moderate huge bulbs with mild flavor, small necks allow for storage up to 1 month
2682 Gladstone   110 intermediate white 4-5" round moderate medium to large, mildly sweet, fresh market, very firm flesh
2680 Walla Walla   110 intermediate white/light brown skin 6" round poor mild and sweet, increased uniformity, upright plants, necks dry down well, disease resistant
2702 Valencia   120 day length-neutral warm golden-brown skin 4-6" round moderate mild and sweet, excellent for fresh bunches and market, for all regions

Organic Onions - Growing Info

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Types of  Onions
Onions (Allium cepa) are cool season biennials, members of the Amaryllidaceae family, which includes garlic, leeks, chives and scallions. Onions started from seed store better than sets, but mature later. Bulbing onions are dependent on day length for bulb production:
  • Short day onions produce bulbs when they receive 11-12 hours of daylight (suitable for Southern areas)
  • Long day onions need 14-16 hours (suitable for latitudes north of 35Ί).
  • Intermediate day onions like Walla Walla and Gladstone fall in between these
  • Day-neutral varieties like Valencia are not dependent on day length to produce bulbs
Soil and Nutrient Requirements
Onions prefer soils rich in organic matter that are well-drained. Optimal pH is 6.2-6.8. They cannot tolerate acid soils, especially in early stages. 80 lbs/acre nitrogen is recommended. Side-dress 4-5 weeks after planting. High levels of sulfur in the soil will increase pungency. Best results come from selecting a bed with the least weed pressure.
Full sun. Onions are very sensitive to day length and shade will dramatically slow growth.
Seeding Depth
Seeding Rate
20 seeds/ft
Plant Spacing
Medium size onions 3-4”, for large onions 4-6”, for sweet onions 4”
Row Spacing
When to Sow
Days to maturity are from direct seeding, subtract 1-2 weeks if transplanting. Direct seed onions as soon as soil can be worked or start transplants 10-12 weeks before planting date. Optimal soil temperature for germination is 75-85°F. Sow in flats or 1” cells, in singles, doubles or triples. When seedlings reach 5” trim to 1” to increase girth. Transplanting is recommended for short growing seasons and sweet onions. Onion seedlings can be planted in clumps of 2-4 plants, spaced 6" apart, without reducing yields. Onion plants can tolerate light frost; transplant after all danger of hard frost has passed, about 2-4 weeks before the last frost date in your area.
Other Considerations
Onions compete poorly with weeds. Cultivate regularly to control weed pressure.
Frost Tolerant
Drought Tolerant
Uniform water supply is important for good bulb development.
Heat Tolerant
Choose heat tolerant varieties for extreme areas.
Seed Specs
6-8M seeds/oz (7M avg.), 95-125M seeds/lb (105M avg.). M=1,000, MM=1,000,000
Seed Coating / Pelleting Info
Some of the varieties we carry receive an organic film coating applied to the seed, which make the seed easier to see during planting.
For fresh eating, onions can be harvested whenever they reach desired size. Storage onions can be harvested when tops dry up and flop over. Pull bulbs from ground and cure for 3-5 days in the field or bring into barn or greenhouse and cure for two weeks at 75-80°F and 80% relative humidity..
Cool slowly, and store at steady temperatures. Rapid cooling followed by a sudden warm period might break dormancy and cause onions to sprout. Optimal storage is at near freezing temperatures at 65-70% relative humidity.
Pest Info
  • Onion Thrips thrive in hot dry weather and can be discouraged by heavy rain or overhead irrigation. Lacewing larvae, pirate bugs and predatory thrips are natural predators.
  • Onion Maggots overwinter in the soil. They feed on the roots of young seedlings, causing wilting and sometimes seedling death. Crop rotation and beneficial nematodes can be helpful.
Disease Info
  • Botrytis leaf blight (Botrytis squamosa) develops as small lesions surrounded by a silvery-white “halo” that grow and eventually extend through the wall of the leaf. Infection by the more common Botrytis cinerea (gray mold fungus) is distinguished by smaller lesions that do not have a “halo” and do not penetrate the leaf. Die-back begins at the leaf tip and can result in premature death of the leaf prior to bulb maturity. The fungus persists as sclerotia in the soil and on crop residues. Protectant fungicides are applied in advance when cool, wet conditions are expected. 
  • Downy Mildew (Peronospora destructor) thrives in extended periods of cool, humid weather. Plant in a well drained area, avoid overhead irrigation, orient rows with prevailing winds and rotate crops.
  • Purple blotch (Alternaria porri and Alternaria alternata) appears as elongated purple lesions that turn silvery over time. Control measures are similar to those for botrytis blight and downy mildew. Yellow cooking onions are not as susceptible to purple blotch as are Spanish onions. Best prevention methods are to practice good sanitation -- never pile cull onions near onion fields -- and crop rotation with non-host plants.
  • Damping off (Pythium/Rhizoctonia) – Avoid excessive moisture.
  • White Rot (Sclerotium Cepivorum) – Destroy infected plants and rotate crops.
Seed Saving Instructions
Insect pollinated. Onions are biennials and generally will not make seed their first year. Store the bulbs in a cool dry place or protect for overwintering outside. In the spring, transplant bulbs outside about 6" apart in rows about 12" apart. Harvest seed heads when 1/2 of the pods are open and showing black seeds. Allow to dry and seeds will be easily shaken out. Use 1/8" screen to help with cleaning. Allium seeds will remain viable for 1-3 years.  

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