Waltham 29

Broccoli

Zone 10a Save Garden

🌱 75d to harvest Rosette

Fragrant, cool-sweet florets arrive in a steady wave—Waltham 29 forms a dense, medium-to-large head with a deep blue-green cast a…

Crop Dates

Milestone	Date
Start Indoors	Dec 19th
Last Frost	Jan 16th
Transplant / Sow Outdoors	Jan 16th
Harvest Begins	Apr 1st
Harvest Ends	Dec 19th

Crop Details

Trait	Value
Days to Maturity	75
Sun Requirements	Full Sun
Growth Habit	Rosette
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	45
Min Soil Temp (°F)	40
Min Night Temp (°F)	32
Harden Off (days)	6

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Frequently Asked Questions

What’s a common broccoli pest or disease for Brassica oleracea var. italica, and how do I treat it?

Black rot (Xanthomonas) often starts as V-shaped yellowing at leaf edges and can spread through the plants, especially in warm, wet weather. Remove and discard infected heads/leaves below the damage, avoid overhead irrigation, and sanitize tools; if you’ve had black rot repeatedly, start with new transplants in clean beds. For pests, watch for cabbage worms (importantly the larvae of cabbage moths); hand-pick early and use a floating row cover to prevent egg laying.

How often should I water Waltham 29 during active head formation?

During the main growth and head-filling phase (roughly from when heads form until harvest), keep the soil consistently evenly moist—about 1 to 1.5 inches (2.5–4 cm) of water per week total from rain plus irrigation. Water deeply so moisture reaches the root zone, then let the top 1 inch (2.5 cm) of soil dry slightly before watering again to reduce disease pressure.

How can I tell when Waltham 29 is ready to harvest?

Harvest when the central head is fully formed and the individual flower buds are still tightly closed (green to dark green), before they loosen or begin to yellow. If the head is starting to separate into visible, loosening buds, it’s already past prime. Cut the main head with 5–7 inches (12–18 cm) of stem; this Brassica oleracea var. italica type often produces smaller side shoots afterward.

Fragrant, cool-sweet florets arrive in a steady wave—Waltham 29 forms a dense, medium-to-large head with a deep blue-green cast and a tightly buttoned texture that feels crisp and substantial in the garden. Expect tender side shoots to follow the main harvest, extending the season with fresh, leafy flavor that shines in stir-fries, steaming, and quick sautés, or as a vibrant base for hearty soups and gratins. Grow Waltham 29 for reliable performance and a satisfying, garden-to-table abundance that keeps on coming through the cooler weeks.