‘Thundercloud’ Switchgrass is a cross between Panicum ‘Northwind’ and Panicum ‘Cloud Nine’, hybridized by Gary Trucks of Michigan. Panicum ‘Thundercloud’ shares the best characteristics of both its parents in that it is both tall and consistently upright. Its foliage is blue green and the airy seedheads are beautiful, from their appearance in mid summer to their tan dried winter presence. Once established, Panicum ‘Thundercloud’ should not be irrigated or fertilized. All Panicums should not be cut down in the fall, since their winter beauty is wonderful.