You can harvest the brussels sprouts when they are between 1 and 2 inches in diameter and still firm - do not wait until leaves yellow. The sprouts on the lower part of the plant will mature first. Brussels sprouts are biennials, meaning that they will flower and set seed the next year and then the plants will die. Most gardeners treat this crop as an annual, unless they are saving seed the second year.
You can harvest the brussels sprouts when they are between 1 and 2 inches in diameter and still firm - do not wait until leaves yellow. The sprouts on the lower part of the plant will mature first. Brussels sprouts are biennials, meaning that they will flower and set seed the next year and then the plants will die. Most gardeners treat this crop as an annual, unless they are saving seed the second year.