- Species and varieties: Brussels sprouts (Brassica oleracea var. gemmifera) are a member of the Brassicaceae family, which also includes cabbage, broccoli, and kale. There are several varieties of Brussels sprouts, including 'Long Island Improved', 'Jade Cross', and 'Diablo'. Each variety may have different growth habits, sizes, and flavors.
- Hybrid or heirloom: Organic Brussels sprouts seeds can be either hybrid or heirloom. Heirloom varieties are open-pollinated and have been passed down through generations, while hybrid varieties are bred for specific traits such as disease resistance and uniformity. Examples of heirloom varieties include 'Long Island Improved', while 'Jade Cross' is a popular hybrid variety.
- Pruning and training: Brussels sprouts benefit from regular pruning to remove yellowing or damaged leaves and to improve air circulation. Pinching off the growing tip of the plant about a month before the first expected frost can encourage the development of larger sprouts. Staking may be necessary to support the tall, top-heavy plants.
- Fertilization needs: Brussels sprouts are heavy feeders and benefit from regular fertilization. Incorporate a balanced fertilizer or compost into the soil before planting. Side-dress with a nitrogen-rich fertilizer every 3-4 weeks during the growing season to promote healthy growth. Avoid over-fertilizing, as this can lead to excessive leaf growth at the expense of sprout development.
- Hardiness zones: Brussels sprouts are suitable for growing in USDA hardiness zones 2-9. They thrive in cooler climates and can tolerate light frosts, making them ideal for fall and winter gardens in many regions.
- Climate requirements: Brussels sprouts require a cool growing season with temperatures between 45°F and 75°F (7°C to 24°C). They prefer full sun and well-drained, fertile soil with a pH between 6.0 and 7.5. Consistent moisture is important for optimal growth, but the soil should not be waterlogged.