* Make sure all grass and weeds are removed from the beds.
* Plant in groups of three or more to give a good splash of colour.
* Check the height the plants will grow. Tall plants such as phlox should be at the back of the bed.
* Plant the types that bloom in spring, summer and fall. Plant in a big bed to give colour all season.
* Feed perennials in spring or early summer with a general-purpose fertilizer such as 6-12-12 (2 kg per 10 sq m) or 20-20-20 (15 ml in 4 L of water).
* Lime can be applied to established perennials in the fall or early spring at the rate of 5 kg per 10 sq m (10 lbs per 100 sq ft).
* Faded blooms should be removed to prevent some perennials from becoming weeds.
* Apply 8 cm (3 in) of peat-bark mulch after planting new perennials.