In the temperate regions, (this will apply for the Highveld) roses will be pruned from the middle of July onwards. In very cold areas you will only prune from mid-August to avoid frost damage.
How to prune?
Remove all growth to a height of 60-80cm — about knee height.
Remove all stems that are dead, diseased, old or misshapen.
Only three to four main stems should remain.
Remaining stems are then cut back another 10cm, making sure that they are all the same height.
Post pruning care
Spread mulch or compost around the rose bushes
Apply fertiliser like Ludwig’s Vigarosa, Eds Magic Roses or Wonder Rose
Dig the compost and fertiliser in
Water well and thereafter once a week until the end of August when you will water twice weekly
Spray the pruned roses with
Ludwigs Insect Spray or Lime Sulphur, to kill dormant fungus and pests