Studies have shown that agriculture can alter the climate through its impact on biogeophysical and biogeochemical properties of the terrestrial ecosystem. To study these impacts the Energy Exascale Earth System Model (E3SM) Land Model (ELM) now includes representation of select cereal crops. In this study, we expand ELM crop model to include bioenergy crops that are projected to increase in cultivation in the future owing to their potential for mitigating climate change. This expansion includes addition of Miscanthus and switchgrass and estimating various parameters associated with their different growth stages and harvest. We focus on Miscanthus and switchgrass, high-productivity crops with deep and dense roots well suited to the ELM crop model’s advanced capability for modeling dynamic root growth. The updated ELM crop model is used to study the impact of bioenergy cultivation on energy, water, and biogeochemical fluxes at various spatial scales. The model is also used to examine the impact on various fluxes of replacing existing crops with bioenergy crops.