brussels sprout seeds - 200+ rare heirloom brussel sprout seeds (long island improved) yields 50-100 sprouts per plant! guaranteed to grow powergrow systems introduced in the 1890s. once the most important commercial sprout variety in the us. compact 24" plants yield 50-100 dark green 11⁄2" sprouts over an extended period. 80-115 days from transplant. sow seeds indoors 6-8 weeks before last frost. sow seeds indoors 1⁄4" deep. plant out just before the last frost. brussels sprouts are a slow-growing, long-season vegetable that requires a regular supply of water. the sprouts are most delicious after frost.