Always choose healthy, well-grown plants and plant after autumn rains. On heavy soils, raise the level of beds and borders with extra topsoil and coarse pumice sand. Before planting, ensure the root ball is saturated and remove the planter pot with minimal root disturbance. Trim any broken roots and plant at the same level as in the container. Dig a hole twice the diameter of the root ball, press in and water once planted. Make sure plants are watered well until established if planting in a drier period. Plant with some general slow-release fertiliser and then every spring, apply organic fertiliser at a handful per square metre (e.g. blood and bone). Planting too closely leads to spindly growth, poor flowering and eventual decline. In a well-planned border, flowering plants should just touch each other to create a full effect without overcrowding. Plant approximately 1m apart.