Armstrong Research and Demonstration Farm
Bell pepper varieties developed for unique fruit color characteristics were evaluated as part of the high tunnel project. Previous evaluation of six colored pepper varieties at the Armstrong Research Farm, Lewis, IA and the Horticulture Research Station, Ames, IA in 2007 indicated only Tequila (green to purple) developed full color for commercial production. The major problem seems to be the high daytime temperatures in the tunnel as well as outdoor field production, which produced a high level of rots. Generally, bell peppers take 45 to 55 days from pollination to green market maturity and an additional 15 days to the red stage (70 days total).
Iowa State University
Taber, Henry G.; Howell, Nicholas P.; and Havlovic, Bernard J., "High Tunnel Colored Pepper Production" (2009). Iowa State Research Farm Progress Reports. 463.