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Gladstone Onion Seeds

Gladstone Onion Seeds


This versatile onion will become your new standby for any recipe. 'Gladstone' is an intermediate-day onion that produces 4"–5" clean and crisp white onions with a delicate, sweet flavor. This onion is ideal for raw applications, like salads, salsas, and sandwiches, and also stands up to cooking and pickling. Intermediate-day onions grow best across the middle of the U.S. in latitudes 32–42. Resistant to pink root. Inert organic coating improves seed visibility when sowing.

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~0.3 g

(~80 seeds)

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  • Variety Info
  • Sowing Info
  • Growing Info
  • Learn More

Variety Info

Days to Maturity: 110 days

Family: Alliaceae

Type: Intermediate-day sweet onion. (Learn more)

Native: Exists only in cultivation

Hardiness: Biennial grown as an annual

Exposure: Full sun

Plant Dimensions: 4" to 5" globe-shaped sweet onions.

Variety Info: 4"–5" white, globe-shaped, sweet onions. 'Gladstone' is an intermediate-day onion with a moderate storage period.

Attributes: Pink Root Resistant

Sowing Info

When to Sow Outside: 4 to 6 weeks before your average last frost date, or as soon as soil can be worked; when soil temperature is at least 45°F.

When to Start Inside: RECOMMENDED. 10 to 12 weeks before your average last frost date. Transplant outdoors 4 to 6 weeks before your average last frost date. The earlier the start, the bigger the bulb. Ideal soil temperature is 60°–85°F.

Days to Emerge: 7–15 days

Seed Depth: ¼"

Seed Spacing: A group of 2 seeds every 4"

Row Spacing: 12" ‒ 18"

Thinning: When 2" tall, thin to 1 every 4"

Growing Info

Harvesting: When onion tops have fallen over and turned yellow or brown, they are ready for harvest. Harvest in the morning, lifting onions with a garden fork. Dry them in the garden in the sun for 2 to 3 days, lightly covering the bulbs with straw, or the tops of other onions to prevent sunscald. Cure onions for 3 to 7 days in a dry area with good air circulation. Once dry, cut the roots to 1/4", and the greens to 1" to create a seal, preventing decay.

Special Care: Keep growing area weed-free. Onion size can decrease 4% per day if competing with weeds‒that’s 50% in 2 weeks. If bulb pushes itself out of the ground, you may cover it lightly with straw, but not soil, as soil will prevent the onion bulb from forming properly.