?90-100 days. Long Island Improved Brussels sprouts seeds. Non-GMO. Brussels Sprouts can be grown in colder climates, and the crop is very tolerant of frost. While the sprouts can take up to one hundred days to reach maturity, they make great crops to grow during the winter and colder months of the year. Brussels Sprouts have been cultivated since as early as the 1500's, and have a strong and bitter taste, similar to that of cabbage. Most popular variety on the market! Grows up to 24" tall, and produces massive amounts of tight, tender heads, that average 1-2" in diameter. Heavy yielder. A real work horse! Excellent freezing variety for long storage. Great for roasting or sauteing!?