- Denver Botanic Garden, Denver, in cooperation with Colorado State University has a plant evaluation program called Plant Select. The purpose is to seek out and identify superior plants from the intermountain region to the high plains
- The Franklin Park Conservatory, Columbus, Ohio
Pennsylvania State University, Landisville, Pa. (research location).
Source: http://www.networx.com/article/annuals-that-thrive-in-sun-and-heat
