Hypericum kalmianum Gemo (Gemo St. John's Wort)Large yellow flowers from July till September Longer blooming then species Attracts butterflies Thin, willow like foliage This selection is more tightly branched then the species and blooms longer as well. Butterflies and native bees are drawn in numbers to its large yellow flowers from July till September. Willow like foliage is unique looking, clean, pest free and adds subtle yet effective texture to the landscape. Hardiness Zone 4 9 Height 2 3 ft