CSU Trial Gardens Photo Library

Access the CSU Trial Gardens Photo Library here to see images of all our annual, perennial, and cool season plants from the past few years.

CSU Trial Gardens 2025 Trial Winners

See the CSU Trial Gardens’ 2025 “Best of” annuals and this years’ trial winners here.

Trial Garden History

The Trial Garden began at the W. D. Holley Plant Environmental Research Center (PERC), located at 630 W. Lake Street on the Colorado State University campus. PERC was in operation from 1971 to 2016. In 1992, Dr. James E. Klett began his role as Director of PERC and became the Faculty Coordinator for the trial program.