The Flowerwood Nursey 3 gal. Knockout Rose Plant is an eye-catching shrub that usually grows 5 ft. tall and wide. As the weather warms, 3 in. diameter cherry-red blooms appear as terminal clusters of single flowers. The flowers have a mild tea rose fragrance and are attractive to butterflies. As long as the plants continue to grow through spring, summer, and fall, this rose will continue to flower.