Genus Rosa Species x Cultivar 'Radtko' Double Knock OutÂ® Common Name Double Knock OutÂ® Rose Patent ID pp# 16202 Height 3 to 4 Feet Spread 3 to 4 Feet Habit Medium, rounded shrub. Moderate growth rate. Zone 4 to 9 Culture Full sun. Flower 3", double blooms with 18-25 petals from spring until frost. Cherry red. Light, slightly spicy fragrance. Flower Color Red Foliage Deep mossy green with blue and maroon highlights. Deciduous. Category: Rose Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Tumblr (Opens in new window) Description Disease resistant, very strong bloomer.