Patterson is a modern hybrid storage champion developed as the superior successor to the beloved Copra onion, bred for unmatched uniformity, larger size, and extreme longevity—making it a go-to for northern growers seeking reliable winter keepers. This long-day variety excels in cool northern climates, producing extra-large, firm yellow bulbs with thick copper-golden skins, moderate pungency, and good sugar content for versatile flavor—perfect for soups, stews, roasting, or fresh slicing. Each bundle contains approximately 75 healthy, premium, non-GMO plants grown with natural and regenerative practices.

Key Details at a Glance

• Day length: Long-Day (best in zones 3–6)
• Days to maturity: 104–110 from transplant
• Mature bulb size: 3–4+ inches, up to 1 lb each
• Storage life: 8–12 months when cured
• Bundle size: Approximately 75 bare-root plants

Why Grow Patterson?

• Ultimate storage onion – Keeps firm and flavorful nearly a full year; outlasts Copra and most varieties.
• Uniform giants – Consistent globe-to-blocky shape and size for easy harvest, packing, and market sales.
• Disease resistant – Strong tolerance to Fusarium and pink root; reliable in northern soils.
• High yields & flavor – Larger than Copra with balanced sweet-pungent taste; great raw or cooked.
• Commercial-grade – Trusted by pros for its firmness, thin necks, and rot resistance.

Growing Tips Direct-transplant as soon as soil can be worked in early spring (soil ≥40°F). Space 4–6″ apart in rows 12–18″ apart. Provide full sun, consistent moisture (1″ weekly), and sidedress with nitrogen near summer solstice. Mulch to retain moisture and suppress weeds. Harvest when 50–70% of tops yellow and fall over; push over the rest and cure in a dry, airy spot for 2–3 weeks.

Standard Information

• Plant type: Bulbing onion (Allium cepa)
• Sun: Full sun (6–8+ hours)
• Soil: Well-drained, fertile loam; pH 6.0–7.0
• Water: Consistent, especially during bulb formation
• Hardiness zones: 3–9 (bulbs form best in long-day regions)

Origin & Quality All plants are grown and shipped as bare-root, dormant starts in biodegradable wrap from Sunbelt Transplants, a trusted leader in premium onion transplants based in the heart of U.S. onion country.

Disclaimer Although these onions are grown by farms that are certified organic, we are not allowed to say it is Certified due to the rule 7 CFR § 205.2. The Farm On Central is in the process of becoming a Certified Handler for the 2026 season. All product provided for the 2026 season will be certified.

SEEDTIME FULFILLED SHIPPING (items fulfilled by Seedtime)

• We ship to the USA only.
• We offer free shipping on all products fulfilled by Seedtime with an order value over $49
• Orders placed before 12pm Eastern Time ship the same day. Orders after 12pm Eastern Time will ship the next business day. Timing applies to orders in the lower 48 States.
• Standard delivery time is 3-7 business days.
• Easy 30 day returns or exchanges.

RETURNS

Your satisfaction means the world to us which is why all of your orders are backed with our 30 Day Satisfaction Guarantee. Either you love it, or you can return it for an equal exchange or get a full refund. Just send us a support ticket to support@seedtime.us and we'll be glad to help you with your return.

Other Vendor Fulfilled Shipping & Returns

We offer products that are fulfilled by other vendors. Vendors shipping rates and return policies may vary and returns may be subject to a restocking fee. Please reach out to support@seedtime.us for any specific questions on vendor shipping or return policies.