Get 25% off all calendars with code CALS25. Shop now >>

Keith S. Warren headshot

Keith S. Warren

Keith S. Warren, tree breeder and nurseryman, has significantly reshaped the tree palette of the American landscape through introduction and promotion of improved tree cultivars. As Director of Product Development for J. Frank Schmidt and Son Co., one of the world’s largest nurseries, he created an extensive tree evaluation program, testing virtually every new deciduous cultivar during his 40-year career. Partnering with scientists, breeders, and nursery growers, he guided 87 new tree cultivars to commercial introduction, including 37 trademarked or patented trees from his personal breeding and selection work.