Clumping Bamboo - 3 Gallon Fargesia Rufa Bamboo 3 Gallon Fargesia 'Rufa' - Multi-cane at 3'+ tall Fastest growing of all cold hardy clumping bamboo. Cold Hardy Clumping Bamboo with hardiness of -5 degrees. Provides an evergreen bamboo privacy screen. Mature height is 10 feet tall by 1/2 inch in diameter.