In this photo taken on Saturday, Feb. 9, 2013, instructor Ted Smith, left, shows Ginger and Heath Grider how to cut and plant a section of a tomato plant during class at THC University

 

              In this photo taken on Saturday, Feb. 9, 2013, instructor Ted Smith, left, shows Ginger and Heath Grider how to cut and plant a section of a tomato plant during class at THC University
In this photo taken on Saturday, Feb. 9, 2013, instructor Ted Smith, left, shows Ginger and Heath Grider how to cut and plant a section of a tomato plant during class at THC University at the Tivoli in Denver. Marijuana can be grown from seed, or from a clipping off a “mother” marijuana plant. Clones, as the clippings are called, grow faster and produce smokeable marijuana much more quickly than seeds. But seeds can be worth the wait, producing hardier marijuana. (AP Photo/Ed Andrieski)