Hybrids
Hybrids are combinations of two or more types of plants. Modern day tobacco stems from a natural hybrid known as Nicotania Tabacum. Tobacco growers make their own hybrids, combining genetic characteristics of two plants and growing seven crops of the new plant to lock in the genetic characteristics. Hybrids are developed for resistance to disease, increased yields, improved flavors and other advances.
For more, read Hot Hybrids.