Height: 6′-8′ Spread: 5′-6′. Found in a willow stand near Silverthorne, Colorado. This naturally occuring hybrid is likely a complex hybrid involving some of these species; S. geyeriana, S. brachycarpa, S. drummondiana and S. wolfii. This willow caught our eye because it has almost pure white prunose branches in winter. Full sun. Zone 3.