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

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Red Spring Full-Size Onions

Red Spring

(F1) Onion Seed

Red long-day onion for overwintering.

White Ace Full-Size Onions

White Ace

(F1) Onion Seed

Our recommended substitute for White Castle.

Sierra Blanca Full-Size Onions

AAS (All-America Selections) Winners

Sierra Blanca

Pelleted (F1) Onion Seed

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

Ailsa Craig Full-Size Onions

Ailsa Craig

Organic Onion Seed

A classic mild yellow onion with excellent size potential.

Monastrell Full-Size Onions

Monastrell

Organic Pelleted (F1) Onion Seed

Long harvest window.

Redwing Full-Size Onions

Redwing

Pelleted (F1) Onion Seed

Reliable long-storage red.

Blush Full-Size Onions

Blush

(F1) Onion Seed

Unique pink specialty onion with excellent storage potential.

Frontier Full-Size Onions

Frontier

(F1) Onion Seed

Downy mildew resistance for a wider range of latitudes.

Elsye Full-Size Onions

Elsye

Organic (F1) Onion Seed

Very upright plant habit.

Red Carpet Full-Size Onions

Red Carpet

Organic Pelleted (F1) Onion Seed

Vibrant red, long-day storage onion.

Safrane Full-Size Onions

Safrane

(F1) Onion Seed

A hard yellow storage onion for the main season.

Ailsa Craig Full-Size Onions

Ailsa Craig

Organic Pelleted Onion Seed

A classic mild yellow onion with excellent size potential.