August has an average maximum temperature of 13.5°C, and an average minimum temperature of 1.3°C. August has an average rainfall of 47.6mm.

What to do this month

  • Prune and spray roses later this month.
  • Prune and feed your Daphne after flowering.
  • Prune your Crepe Myrtle which flowers on new wood.
  • Prune Jasmines and later summer-flowing Clematis.
  • Prune winter-flowering shrubs as they will benefit from a trim as flowering finishes.
  • Plant Camellias and Azaleas.
  • Magnolias will come into bloom this month and they need protection from hot or strong winds.
  • Camellias, Rhododendrons and Azaleas in bud will respond to a little extra water.
  • To get darker blue Hydrangeas, blueing tonic can be watered into soil around the plants. Mark your calendar for follow-up applications a month apart from September to December. There is also a pinking agent available.
  • Fruit trees: Spray peaches and nectarines for leaf curl if leaves have not yet appeared. If leaf and curl is evident, remove the leaves and place in bin (not compost). Fertilise with high-nitrogen fertiliser and water well. Fruit trees are still able to be planted.
  • Check for signs of scale on citrus trees. Spray with horticultural oil if there’s any activity to kill eggs and insects.
  • You are still able to move (transplant) most shrubs and small trees.
  • New plantings will need to be watered if there’s no rain.
  • Don’t forget to use Seasol and Powerfeed on new plantings every fortnight for 6 to 8 weeks.
  • Check if plants under eaves and large canopies are requiring watering.
  • Divide clumps of Water Irises, Lilies and herbaceous perennials.
  • Feed your soil. Manure added at this time will assist all plants heading into spring.
  • Check your mulch to see if more is needed. Dig old mulch to aid moisture retention.


  • Come in and get your seed potatoes but wait for warmer weather to plant. Prepare garden beds by applying manure, blood and bone and a few bags of compost to add nutrients.
  • Green manure crops may be dug in now. If necessary, add garden lime to vegetable plots.


  • Tomato seeds in a warm place. Seedlings may be grown on under glass or some other warm protected area until last frost.


  • Asparagus crowns
  • Jerusalem and globe artichokes
  • Onion seedlings
  • Rhubarb
  • Spinach


  • Artichoke
  • Asian greens
  • Brussels sprouts
  • Cabbage
  • Carrot
  • Cauliflower
  • Leek
  • Silver beet

Flowers and bulbs

  • Plant summer and autumn-flowering bulbs such as Liliums, Peonies, Gladioli and Dahlias.
  • Summer-flowering annuals will start to appear. Winter plants can still be planted now for a spring display.
  • Daffodils will be flowering. Deadhead annuals for a continued spring display.
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