Ailsa Craig
Onion · Bulbing (Full-Size)
Heirloom
Allium cepa
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Amaryllidaceae (Onion family) · Genus: Allium
Characteristics
Color
Yellow
Day Length
Long-Day
Flavor
MildSweet
Shape
Round
Size
Giant
Texture
FirmJuicy
About the Plant
Life Cycle
Biennial
Harvest year 1, seeds year 2
❄
Hardiness
Cool-Season/Hardy
☀
Exposure
Full Sun
💧
Moisture
Evenly Moist
🌍
Origin
United Kingdom
🌱
Germination
7–10 days
at 35–95 °F
⏳
Days to Maturity
100–110 days
Plant Height
Up to 1 1/2 ft
Mature Spread
Up to 6 in
⚖
Fruit Weight
32–96 oz
How to Plant
🏠
Start Indoors
10-12 Weeks Before Last Frost
Transplant
4-6 Weeks Before Last Frost
🌸
Direct Sow (Spring)
4-6 Weeks Before Last Frost
🍂
Direct Sow (Fall)
6-8 Weeks Before First Frost
Planting Depth
1/4–1/2 in
Seed Spacing
1–2 in
Row Spacing
12–18 in
Thin To
3–4 in
🌡
Optimal Soil Temp
65–85 °F
🌡
Soil Temp
35–95 °F
🌡
Air Temp
28–80 °F
When to Plant in Your Area
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