Jul 27, 2011 / News / Pat Chinn-Sloan Twitter Facebook Pinterest Email July Color Appears at the Washington Park Arboretum Hydrangea involucrata ‘Tama Azisai’ Lonicera xylosteum (Fly honeysuckle) Magnolia virginiana var. australis Rhododendron degronianum ssp. yakushimanum Sorbus scopulina var. cascadensis Complete details.