SHERIDAN, Wyo. (AP) — Joe Wesnitzer's goal of year-round growing has taken his farming off a horizontal plane to new heights.

Behind his house, Wesnitzer constructed a greenhouse filled with more than 1,000 plants, most of which don't root themselves in soil, but out of a vertical system instead.

University of Wyoming extension horticulture specialist Karen Panter, Ph.D., said vertical systems have been available for about 20 to 30 years but recently gained popularity. She said while some older systems use peat moss, the latest technology is a hydroponic system, which forgoes soil and grows ve...