Miscanthus x giganteus is a perennial grass species that is currently being studied extensively as a biomass energy crop.  As part of the Energy Biosciences Institute at the University of Illinois, many aspects of Miscanthus x giganteus establishment, growth, and development are being examined.  One important aspect during establishment is understanding different factors that could affect overwinter survival.  Newly established stands of Miscanthus x giganteus tend to have poorer survival than more established stands.  It was believed that older stands were more insulated and perhaps better protected from harsh winter elements.  A site in Decatur, IL with adjacent plots of one-, two-, three-, and four-year-old stands of Miscanthus x giganteus allowed for direct comparison of winter soil temperatures and moisture levels between plots of different ages.  Results showed a significant difference in soil temperature and moisture between plots, with older plots displaying more moderated temperature fluctuations.  This site also allows for the direct comparison in the speed of canopy closure by measuring light interception.  Results will show the speed of Miscanthus x giganteus canopy closure and how the speed increases with stand age.