Variety field guide
What to expect from Waltham 29 Broccoli
Waltham 29 is a biennial broccoli selection grown for tender stems, shoots, leaves, flower buds, cool-season harvest, and seed saving.
Read the complete product descriptionTraits, flavor, garden use, variety notes, and the full catalog record
Fall broccoli, cool regions, freezing, and reliable home-garden heads are where this variety earns its place. This is not a decorative catalog promise. It is a crop that responds to soil, temperature, spacing, and the discipline of regular harvest.
About Waltham 29
Waltham 29 is a biennial selection of broccoli, with an upright/erect habit and an expected height or spread of 19–24 in. It is best suited to tender stems, shoots, leaves, flower buds, cool-season harvest, and seed saving. Notable traits include medium blue-green head; green, brassica-rich flavor with tenderness shaped by harvest timing.
Gardeners comparing named strains should evaluate Waltham 29 for uniformity, flavor, timing, and plant form rather than assuming another broccoli will perform identically.
History and provenance
Broccoli, cabbage, cauliflower, Brussels sprouts, collards, kale, and kohlrabi are distinct crop groups within Brassica oleracea. Generations of selection emphasized different plant organs: flower buds, heads, leaves, side buds, or swollen stems. Their shared species identity is especially important in seed-saving isolation. Waltham 29 was developed through public breeding work in Massachusetts and became a standard open-pollinated broccoli. It remains valued for cool-season reliability.
Growing facts
| Scientific name | Brassica oleracea L. Italica Group |
|---|---|
| Life cycle | Biennial |
| Maturity | 60-69 Days |
| Germination | 5-10 Days at 50–65 °F |
| Seed depth | 1/4 in |
| Plant height / spread | 19–24 in |
| Growth habit | Upright/Erect |
| Spacing | 18 in between plants; 30 in between rows |
| Sunlight | Full sun |
| Soil | Loamy; pH 6.0–6.5 |
| Water | Moderate |
| Support | No-Support |
Starting Waltham 29 from seed
Sow 1/4 in deep and keep the seed zone evenly moist. Expect emergence in 5-10 Days when the seed-zone temperature is near 50–65 °F. Germination preparation: Start in clean seed-starting mix when season length requires it, then transplant at a sturdy but not root-bound stage. Light requirement: Cover evenly to 1/4 in. Soaking: None required. Stratification: None required. Scarification: None required.
Planting and care
Plant during spring/Fall and provide full sun. Space plants 18 in apart with 30 in between rows. Use loamy with a pH near 6.0–6.5, and follow a moderate watering plan. Support requirement: No-Support. Frost response: Semi-Hardy. Medium to large container or in-ground bed; avoid crowding
Harvest and use
Approximately 60-69 Days, from transplanting to the primary market harvest stage. Weather, soil temperature, and planting method can shift the actual harvest date. Harvest: Medium blue-green head. Uses: Tender stems, shoots, leaves, flower buds, cool-season harvest, and seed saving. Flavor: green, brassica-rich flavor with tenderness shaped by harvest timing. Seed saving: Insect-pollinated Brassica oleracea. Best uses include tender stems, shoots, leaves, flower buds, cool-season harvest, and seed saving. Flavor and eating quality: green, brassica-rich flavor with tenderness shaped by harvest timing.
Saving seed
Select several healthy, true-to-type Waltham 29 plants that match the expected upright/erect habit and overall plant form. Avoid saving seed only from the earliest or largest individual unless that is your deliberate selection goal. Pollination system: Insect-pollinated Brassica oleracea. Crop groups within Brassica oleracea can cross with one another. Separate compatible varieties that may flower together, or use cages, barriers, hand pollination, or another documented control appropriate to the crop. Waltham 29 is a biennial. Seed production may require overwintering, vernalization, or more than one growing season, depending on climate and crop biology. Clean the seed carefully, dry it thoroughly away from direct heat, label the lot with variety and year, and store it cool, dark, and dry. Test germination before an important planting or distribution season.
Common problems
Common concerns: Flea beetles, imported cabbageworm, cabbage loopers, aphids, slugs, root maggots, and clubroot risk where the pathogen is present. Management: Use rotation, insect netting before pests arrive, regular leaf inspection, sanitation, and well-drained soil. Do not plant the same brassica family repeatedly in one bed. Diagnosis note: Similar symptoms can have different causes. Compare plants of the same age, record weather and irrigation, and use local Extension or diagnostic support before applying a control.
Frequently asked questions
Frequently Asked Questions - Waltham 29
When is Waltham 29 ready? Use 60-69 Days. Approximately 60-69 Days, from transplanting to the primary market harvest stage. Weather, soil temperature, and planting method can shift the actual harvest date.
How long does germination take? Expect 5-10 Days at about 50–65 °F. Cooler, hotter, crusted, saturated, or dry seedbeds can slow emergence.
How large does it grow? Expect about 19–24 in with an upright/erect habit. Space plants 18 in apart and rows 30 in apart. Support: No-Support.
Can it grow in a container? Medium to large container or in-ground bed; avoid crowding Use a container with drainage and enough volume to maintain the listed spacing and steady moisture.
Can I save seed? Insect-pollinated Brassica oleracea. Keep compatible varieties isolated and allow selected plants to reach full seed maturity.
