The Brussels sprout is a cultivar in the Gemmifera group of cabbages (Brassica oleracea), grown for its edible buds. The leafy green vegetables are typically 2.5–4 cm (0.98–1.6 in) in diameter and look like miniature cabbages. The Brussels sprout has long been popular in Brussels, Belgium, and may have originated there. They contain good amounts of vitamin A, vitamin C, folic acid and dietary fiber. Moreover, they are believed to protect against colon cancer, because they contain sinigrin.
Brussels sprouts grow in temperature ranges of 7–24°C (45–75°F), with highest yields at 15–18°C (59–64°F). Fields are ready for harvest 90 to 180 days after planting. In the home garden, "sprouts are sweetest after a good, stiff frost".