Organic Waltham 29 broccoli is a cool-season crop that can be started indoors 6–8 weeks before the last spring frost or sown directly in the garden. Seeds should be planted about ½ inch deep in fertile, well-drained soil with a pH of 6.0–7.0 and full sun. Seeds germinate in 3–14 days, and seedlings should be thinned to 12–18 inches apart once true leaves appear.
Broccoli grows best in cooler weather and may benefit from shade in warmer regions. The main head is usually ready to harvest about 85 days after planting when it reaches 5–6 inches wide. After harvesting the main head, smaller side shoots will continue to grow. Waltham 29, developed by the University of Massachusetts around 1950, is known for its cold tolerance, high yields, and strong performance in the northeastern and Pacific Northwest United States.
Sourced from True Leaf Market in 2026.
Organic Waltham 29 broccoli is a cool-season crop that can be started indoors 6–8 weeks before the last spring frost or sown directly in the garden. Seeds should be planted about ½ inch deep in fertile, well-drained soil with a pH of 6.0–7.0 and full sun. Seeds germinate in 3–14 days, and seedlings should be thinned to 12–18 inches apart once true leaves appear.
Broccoli grows best in cooler weather and may benefit from shade in warmer regions. The main head is usually ready to harvest about 85 days after planting when it reaches 5–6 inches wide. After harvesting the main head, smaller side shoots will continue to grow. Waltham 29, developed by the University of Massachusetts around 1950, is known for its cold tolerance, high yields, and strong performance in the northeastern and Pacific Northwest United States.
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