Creeping bentgrass is a cool season grass commonly grown on golf course putting greens in the transition climate zone in North and South Carolina. Due to the lack of adaptation, bentgrass is subject to extensive damage in the hot months of summer. The exact physiological responses are still being resolved, but the end result is less vigorous growth and depressed plant health in general. Canopy quality (“greenness”, density, texture, etc.) declines as canopy photosynthetic rate, respiration, carbohydrate availability and root function are impacted by heat. There is some evidence to suggest that sensitivity to heat may be linked to nitrogen (N) nutrition, but a link, either positive or negative has never been established experimentally. This study was initiated to address that question. In growth chambers, bentgrass cores taken from established greens in the field were exposed to different temperature and N regimes - 3 temperatures/ 2 N regimes in the first study and 2 temperatures/ 3 N regimes in the second study - under ideal light and moisture conditions. Root and shoot growth, canopy photosynthesis, and turf quality were evaluated over a 4 week period. The study included exposures to 15N labeled nitrate at specific time intervals to determine changes occurring in root function, and assessment of bentgrass susceptibility to fungal disease infestations. Furthermore, various growth regulating chemicals were applied in some of the experiments to explore the relationship between temperature, N, and pesticide applications.