Seagrass beds are among the most productive ecosystems. Warming events and other abiotic stressors, however, are causing widespread declines in seagrass productivity. These stressors can be difficult for managers to reduce or remove. Previous research indicates that increased genetic diversity within a population may enhance resistance and recovery (i.e., resilience) to stress. Halodule wrightii, a seagrass species used in restoration in the Gulf of Mexico, inhabits shallow waters vulnerable to heating and beds exhibit a range of genotypic variation. Yet, the relationship between genotypic variation and resilience to heat stress for this species is unclear. To test this hypothesis, a mesocosm experiment was done at Mote Marine Laboratory’s Aquaculture Research Park in Sarasota, Florida. Twenty-four H. wrightii patches were collected from St. George Island State Park, Apalachicola, Florida, a site known to be high in genotypic diversity. These patches were ≥ 8 m apart to increase the chances of each being a unique genotype. Patches were planted into containers to produce replicate beds of increasing genotypic levels. Replicates were assigned to one of twelve raceways. An additive approach was used, and each replicate was planted at the same density. Following a three-week acclimation period, half of the raceways were ramped to 35 °C for a two-week heat stress followed by seven weeks at 27 °C for recovery. The other half of the raceways remained at 27 °C. Throughout, productivity was measured as shoot length, shoot density, and chlorophyll-a fluorescence. Biomass was taken at the end of study. Heat appeared to benefit productivity. After seven weeks, heated replicates had higher shoot density and biomass than controls. Microsatellite genotyping is being done to verify the genotypic variation planted and relate variation to resilience. Results will be used to provide insights into the use of genetic variation for optimizing restoration success.