Full-Size Onion Seeds & Plants | Johnny's Selected Seeds

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Onions receive their cue to start bulbing from day length, and to grow onion plants that form full-size bulbs by harvest time it is important to choose varieties adapted to the maximum growing season of day length in your region. Johnny's offers a selection of full-size onions varieties for each of the three day-length adaptations: long-day, intermediate-day, and short-day. Use our Full-Size Onion Comparison Chart to select the best varieties for your region, and to compare bulb size, color, shape, adaptability, storage potential, and other distinguishing characteristics.

Full-Size Onion Varieties | Comparison Chart (PDF)

Map of Long-Day, Intermediate-Day & Short-Day Onions

51 Products

Walla Walla Onion Plants

Walla Walla

Onion Plants

The famous juicy, sweet regional favorite from Walla Walla, Washington.

Expression Full-Size Onions

Expression

Pelleted (F1) Onion Seed

Large, intermediate-day, yellow Spanish variety.

Monastrell Full-Size Onions

Monastrell

Organic Pelleted (F1) Onion Seed

Long harvest window.

Sierra Blanca Onion Plants

AAS (All-America Selections) Winners

Sierra Blanca

(F1) Onion Plants

Big, mild white onions from a widely-adapted day-neutral variety.

Ailsa Craig Exhibition Onion Plants

Ailsa Craig Exhibition

Onion Plants

A classic mild yellow onion with excellent size potential.

Red Spring Full-Size Onions

Red Spring

(F1) Onion Seed

Red long-day onion for overwintering.

Elsye Full-Size Onions

Elsye

Organic (F1) Onion Seed

Very upright plant habit.

Red Rock Full-Size Onions

Red Rock

(F1) Onion Seed

The best red onion for southern growers.

Madalyn Full-Size Onions

Madalyn

(F1) Onion Seed

Dependable short-day onion.

Bridger Full-Size Onions

Bridger

Pelleted (F1) Onion Seed

The best onion for overwintering in the North.

Scout Full-Size Onions

Scout

(F1) Onion Seed

Early, adaptable intermediate-day Spanish type with disease resistance.

White Castle Full-Size Onions

White Castle

(F1) Onion Seed

Short-day onion with excellent color and disease resistance.

Blush Plants Full-Size Onions

Blush Plants

(F1) Onion Plants

Unique pink specialty onion.

Candy Onion Plants

Candy

(F1) Onion Plants

Widely adapted Walla Walla type for growing farther South.

T-448 Full-Size Onions

T-448

(F1) Onion Seed

Earliest long-day overwintering onion for the North.

Yellow Granex Onion Plants

Yellow Granex

(F1) Onion Plants

Short-day for southern growers only, grown as Vidalia type in Georgia.

Walla Walla Sweet Full-Size Onions

Walla Walla Sweet

Organic Onion Seed

The famous juicy, sweet regional favorite from Walla Walla, Washington.

Out Of Stock

Cabernet Onions

Cabernet

Organic (F1) Onion Seed

Early yields of red onions without sacrificing size.

Out Of Stock