Long Island Improved is the most common and widely adapted open pollinated Brussel Sprout variety for the home vegetable garden! Compact plants grow up to 24 inches tall and produce massive amounts of tight, tender heads that average 1 1/2" in diameter. Relative maturity is 100 days from sowing.Historians believe that the ancient Romans first cultivated Brussels sprouts, but Belgium has the greatest claim on this tiny vegetable. As the name indicates, Brussels sprouts grew in great abundance around the city of Brussels. Since the 1900s, growers in California has produced most of the United States' supply of this vegetable; Long Island Improved in particular is a favorite variety of commercial growers.