Green construction is a fairly new thing, and people are bound to make some mistakes. Up in St. Chuck a green roof of a parking structure collapsed as the heavy snow was melting. This particular roof was planted with native prairie species, and you have to think, guys, that bloody stuff is heavy. Clearly the architects had never had to harvest prairie biomass or collect divots of prairie sod from over 100 plots and then drag them to a car and then into a lab. If they had they would have known how heavy prairie is, especially when totally saturated. The collapse is unfortunate, but let's hope people learn from this misfortune and only plant their prairie on top of appropriately hefty structures in the future.