With some 270 species, "Penstemon" is the largest genus endemic to North America, with examples to be found in every state in the continental U.S. Penstemons are particularly beloved by rock gardeners, but as Panayoti Kelaidis points out in his foreword, they belong in every garden, since "one penst[...]
Fresh from his award-winning monograph on penstemons, Robert Nold turns his attention to one of the best-loved - and most frequently misunderstood - groups of garden plants. "Columbines: Aquilegia, Paraquilegia, and Semiaquilegia" is the first gardener's guide to these striking plants in more than h[...]