A close relative to cabbage, Brussels sprouts are cool weather that requires fertile heavy soil. You can either start seeds indoors in seedling trays or outside in a seedling bed. It is important to transplant Brussels sprouts to encourage a strong root system. Transplant seeds into permanent locations 100 days before the last frost and plant seeds 4 to 5 weeks prior to transplanting. Be sure to mulch around the bottom of the plants and water well in the hotter months as Brussels sprouts become bitter when allowed to dry out. Harvest when sprouts are an inch in diameter and tight. Breaking off the leaf directly below the sprout will help in sprout production. Buy Brussels Sprouts seeds online.Brussel sprouts are a great cold climate crop, they are very tolerant to Frost. They are great to grow during the colder months of the year. They have a strong bitter taste similar to cabbage.