This USGA Green Section Collection — assembled to supplement the April 3, 2015 issue of the Green Section Record (vol. 53 issue 7) — Provides useful resources pertaining to the use of plant growth regulators on turfgrass. The information contained in this collection is not all-inclusive but is intended to offer additional information about plant growth regulators, why they are used, and how they can benefit turfgrass and the game of golf.