Waltham 29 Broccoli Seeds

Waltham 29 Broccoli is a cold-hardy heirloom that has earned its place in kitchen gardens for decades—producing dense, flavorful central heads followed by an abundance of tender side shoots that extend the harvest well into cool weather. Developed at the University of Massachusetts for superior performance in northern climates, this variety delivers rich, nutty flavor that tastes nothing like its grocery-store counterpart. A must-have for fall gardens and anyone who loves the Pacific Northwest growing season.

Growing Instructions: Start indoors 6–8 weeks before last spring frost, or direct sow in midsummer for a fall harvest. Broccoli prefers cool weather (55–75°F) and will bolt in summer heat. Harvest central heads before flowers open, then continue cutting side shoots for weeks of additional harvest.

• Botanical Name: Brassica oleracea var. italica
• Plant Type: Annual (cool season)
• Planting Time: Spring (transplant 2 weeks before last frost) or midsummer for fall harvest
• Planting Depth: ¼ inch indoors; ½ inch direct sow
• Spacing: 18–24 inches apart
• Days to Germination: 5–10 days
• Days to Harvest: 75–80 days from transplant
• Mature Height: 18–24 inches
• Light Needs: Full sun (6+ hours)
• Water Needs: Moderate to high — 1–1.5 inches per week; consistent moisture
• Difficulty: Moderate
• Seed Type: Heirloom, Open-Pollinated
• Cold Hardiness: Excellent — handles light frost