90-100 Days to maturity7-10 Days to sproutBrussels seeds per packet: About 1,000Brussels seeds per Oz: About 7,500Brussels seeds per Lb: About 120,000Plant 1/4″-1/2″ deep, in rows 24″-36″ apart, thinning to 12″-18″ apart once the seeds sprout.Growing Brussels Sprouts is all about timing. It is a long season crop that achieves the best flavor if matured after the first frost. Count back the days to maturity from the first frost date in your area. Plant Brussels Sprout seeds directly in the garden in a warmer climate. Start transplants inside in a cooler climate. Get them in the ground when you set out your warm season crops. Mulch to retain even soil moisture and keep weeds down. As the little sprouts mature, harvest from the bottom of the stalk, removing the leaves as you go.