- You will get 180 Seeds of Waltham Broccoli Heirloom Open Pollinated Vegetable Seeds. - Sunlight: Full Sun. - Life Cycle: Annual. - Watering: Medium. - Waltham 29 Broccoli seeds. - Broccoli, a biennial most commonly grown as an annual, is a must-have for gardeners in any climate. - A member of the annula, it’s unsurprising that broccoli might have been bred from a cabbage plant thousands of years ago. Today, it’s one of the most popular vegetables in the US and is grown in almost every state, with particularly large volumes coming out of California. Although different varieties of broccoli vary in size and shape, almost all are greenish-blue in color with an occasional purplish-green crown. - Waltham 29 broccoli is an heirloom, compact plant that grows blue-green main heads that are 4–9″ across as well as numerous side shoots for an extended harvest season and high yields. The tall plants grow long stalks and have good cold resistance, making them a perfect choice for late summer or fall plantings. Don’t fret if you’re living in a warm climate: you can grow it over the winter. Heads do go to flower quickly after maturing, so be sure to keep a watchful eye on your plants. It’s a good choice for small gardens and for freezing if you’re looking to preserve your harvest year-roun. - Germination: - Seed Depth: 1/8″. - Space Between Plants: 18″. - Space Between Rows: 18–30″. - Germination Soil Temperature: 50–70°F. - Days for Germination: 7–10. - Sow Indoors: 5–9 weeks before average last frost date. - Sow Outdoors: 2–3 weeks before average last frost date or as soon as soil is workable. - Botanical Name: Brassica oleracea var. italic.