Consider planting trees and shrubs with autumn colours and that grows well in your area. Trees with exceptionally beautiful autumn colours are the Chinese & Japanese Maple; silver birch or combretum.
Trim summer flowering shrubs and creepers.
Water azaleas and camellias regularly to avoid the flower heads to fall off.
Seed of Dimorphotheca sinuata (Namaqualand daisy) can still be sown in all areas.
As long as dahlias and cannas are flowering water them once a week if the weather is dry. Water liliums and evergreen bulbous plants such as agapanthus, red hot pokers and day lilies once every three weeks when the weather is dry.
Continue lifting evergreen agapanthus, day lilies and summer flowering red hot pokers if they are over crowded.
Stop feeding all pot plants except calceolarias, cinerarias, cyclamen, primulas and winter flowering bulbs.
Water all pot plants, except those mentioned above, less frequently as the weather gets cooler. Never let them dry out, however. This is important especially for ferns and orchids. As the foliage of amaryllis, achimenes, tuberous rooted begonias, caladiums and gloxinias starts dying back, gradually reduce watering.
Pull up all summer vegetables that have finished bearing. Put healthy plants on the compost heap, but never do this with unhealthy plants.
Plant the following: Broad bean; Dwarf spinach; Garlic; Kohlrabi; Leek; Lettuce; Parsnip; Radish; Swiss chard; Turnip