When the cool-season growth potential (GP) is lower than the warm-season GP, the difference between them (the ΔGP) will be negative. In this episode, I discuss ΔGP and three different ways to think of summer duration. I discussed this blog post: https://www.asianturfgrass.com/post/summer-assessment-with-delta-gp/ Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Get ATC newsletters at https://www.asianturfgrass.com/newsletter/Turfgrass information and decision-making tools at https://www.paceturf.org/PACE Turf YouTube channel at https://www.youtube.com/user/paceturfATC's YouTube channel at https://www.youtube.com/asianturfgrasscenter Register for my Harrogate and San Diego seminars at these links: https://gcsaaconference.com/education/session-detail?evt_id=737742c0-bb52-4192-ab34-f06c2413df04&ses_id=d85db2dc-ec5b-48c4-820f-57abce2a5193https://www.btme.org.uk/continue-to-learn.htmlIf you'd like to attend the 15th International Turfgrass Research Conference in Japan, here's a direct link to the conference website: https://itrc2025.turfsociety.com/