Waltham
Broccoli · Heading / Calabrese
Heirloom
Brassica oleracea var. italica
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Brassicaceae (Mustard family) · Genus: Brassica
About
Produces 6 inch, dark blue-green heads with medium beads and good side shoot production. Late-season variety that will not head well in hot weather.
Characteristics
Color
Green
About the Plant
Life Cycle
Annual
❄
Hardiness
Cool-Season/Hardy
☀
Exposure
Full Sun
💧
Moisture
Evenly Moist
🌱
Germination
10–15 days
at 45–95 °F
⏳
Days to Maturity
85–92 days
Plant Height
1.5–2 ft
Mature Spread
1.5–2 ft
Fruit Size
4–8 in
How to Plant
🏠
Start Indoors
6-8 Weeks Before Last Frost
Transplant
2-4 Weeks Before Last Frost
🌸
Direct Sow (Spring)
2-4 Weeks Before Last Frost
🍂
Direct Sow (Fall)
12-14 Weeks Before First Frost
🪴
Container Friendly
Yes
Planting Depth
0.5 in
Seed Spacing
18 in
Row Spacing
36 in
Thin To
18 in
🌡
Optimal Soil Temp
60–85 °F
🌡
Soil Temp
45–95 °F
🌡
Air Temp
28–80 °F
When to Plant in Your Area
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Planting and Care Instructions
Start seeds indoors, 6 to 8 weeks before the last frost or after danger of frost, sow outdoors. Thin when plants are a few inches tall. Harvest before flower stalk forms.
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