Sudden Impact for Roses is ideal for all flowering plants except natives and bare-rooted roses. Pellet form Organic-based Boosted fertiliser 9:4:12 – plus the full range of secondary nutrients and micronutrients in a natural form along with boosted levels of Iron and Magnesium. Users of Sudden Impact for Roses consistently report the following: An increase in the number of flowers. An increase in the quality of individual blooms. Continued general plant vigour and sturdy growth. An improvement in the health of the plants, with increased resistance to fungal disease such as black spot, rust and powdery mildew, resulting in a marked reduction in the need for preventative spraying by up to two thirds.