Acknowledgements
This research was supported by NSF-IGERT and NSF GK-12 Fellowships (HF Cooper), NSF Bridging Ecology and Evolution grant DEB‐1914433 (RJ Best, GJ Allan, R Lindroth, TG Whitham), NSF MacroSystems grant DEB-1340852 (GJ Allan, TG Whitham, CG Gehring, & KC Grady), NSF Macrosystems grant DEB-134056 (KR Hultine), NSF DBI-1126840 (TG Whitham), which established the Southwest Experimental Garden Array. We thank our agency partners for helping to facilitate use of the common gardens: Dana Warnecke and Kelly Wolf at Arizona Game and Fish (Agua Fria), Erica Stewart at the Bureau of Land Management (Yuma), and Barry Bakker, Phil Adams, and Kristen and Matt Redd at The Nature Conservancy’s Canyonlands Research Center at Dugout Ranch. We acknowledge Christopher Updike, Zachary Ventrella, Davis Blasini, Dan Koepke, and Matthew McEttrick, along with many volunteers for help establishing and maintaining the common gardens. We thank Helen Bothwell for her help developing and troubleshooting the SNP library. Lastly, thanks to Jacob Cowan, Michelle Hockenbury, Teresa Reyes, and Michelle Bem for assistance with data collection in the field, and the Cottonwood Ecology and Community Genetics Lab for their constructive comments and reviews.