Aug 30, 2011 / News / Pat Chinn-Sloan Twitter Facebook Pinterest Email August Color Appears at the Washington Park Arboretum Catalpa X erubescens (Hybrid Catalpa) Hibiscus ‘Lohengrin’ Kalopanax pictus (Prickly castor-oil tree) Quercus hypoleucoides (Silverleaf oak) Sequoia sempervirens ‘Henderson Blue’ Complete details.
