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

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Monastrell Full-Size Onions

Monastrell

Organic Pelleted (F1) Onion Seed

Long harvest window.

Madalyn Full-Size Onions

Madalyn

(F1) Onion Seed

Dependable short-day onion.

Talon Full-Size Onions

Talon

Organic (F1) Onion Seed

Organic long-day storage onion.

T-448 Full-Size Onions

T-448

(F1) Onion Seed

Earliest long-day overwintering onion for the North.

White Castle Full-Size Onions

White Castle

(F1) Onion Seed

Short-day onion with excellent color and disease resistance.

Yellow Granex Onion Plants & Sets

Yellow Granex

(F1) Onion Plants

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

Elsye Full-Size Onions

Elsye

Organic (F1) Onion Seed

Very upright plant habit.

Expression Full-Size Onions

Expression

Pelleted (F1) Onion Seed

Large, intermediate-day, yellow Spanish variety.

Redwing Full-Size Onions

Redwing

Pelleted (F1) Onion Seed

Reliable long-storage red.

White Ace Full-Size Onions

White Ace

(F1) Onion Seed

Our recommended substitute for White Castle.

Cabernet Full-Size Onions

Cabernet

(F1) Onion Seed

Early yields of red onions without sacrificing size.

Out Of Stock

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