Sienna Glenn tends to be a more cold hardy variety. At maturity it features a pyramidal form with nice uniform branching. It features showy red flowers along the branches in the spring before leaves appear. Foliage turns to a showy yellow, orange, burgundy in the fall. Sienna Glenn is an adaptable tree, which can tolerate moderately wet and dry conditions, and shows good disease and mildew resistance. It is a reliable choice considering its hardiness, adaptability, and low maintenance.