Climber, Hybrid Gigantea, Large-Flowered Climber. Yellow to white. Large, semi-double to double, in small clusters bloom form. Once-blooming spring or summer. USDA zone 6b through 9b (default). Height of up to 19' 8" (up to 600 cm). Width of up to 13' 1" (up to 400 cm). Alister Clark (1864-1949) (1928).