www.seedlingsrus.com call 215 651 8329 Highland Hill farm We deliver and plant.. A Jolly 'Green Giant' Spotted at the National Arboretum Hoe! Hoe! Hoe! Green Giant! 'Green Giant' arborvitae, that is (Thuja standishii x plicata). A US National Arboretum elite plant, this ornamental, pyramid-shaped conifer is an outstanding landscape tree that gives you the look you want with improved performance. The National Arboretums breeding programs are recognized for developing noteworthy ...