December

December has an average maximum temperature of 26.1°C, and an average minimum temperature of 11.4°C. December has an average rainfall of 53.2mm.

What to do this month

  • Remove wispy growth from Wisteria and continue until main pruning in winter.
  • Azaleas and once-flowering spring roses need to be pruned after they have finished blooming.
  • Dead head Rhododendrons, Camellias and Azaleas. Apply mulch, fertilise lightly and keep damp. Check for insects such as lace bug (leaves will have a silvery look on top and rusty brown appearance underneath) or spotted mite infestation under leaves. Spray with Confidor or place tablets in soil.

Vegetables

  • Top up mulch and keep water up to plants
  • Plant some blue (borage), purple (sage) and yellow (sunflower) plants in your vegie garden for pollinating insects.

Sow

  • Beans
  • Broccoli
  • Cabbage
  • Carrot
  • Celery
  • Cauliflower
  • Cucumber
  • Lettuce
  • Parsnip
  • Pumpkin
  • Radish
  • Spinach
  • Spring onion
  • Sweet corn
  • Zucchini

Plant

  • Beans dwarf
  • Beetroot
  • Cabbage
  • Capsicum
  • Chilli
  • Cucumber
  • Eggplant
  • Leek
  • Lettuce
  • Pumpkin
  • Silver beet
  • Sweet corn
  • Tomato
  • Zucchini

Harvest

  • Asian greens
  • Beans
  • Beetroot
  • Carrot
  • Lettuce
  • Onion
  • Potato
  • Radish
  • Shallots
  • Silver beet
  • Turnip
  • Zucchini

Flowers and bulbs

  • Plant summer and autumn annuals.
  • Top up mulch and water beds.
  • Continue to deadhead roses. Deadhead annuals and perennials to prolong flowering and tidy Hellebores (may be showing signs of heat stress).
  • Continue with sowings of autumn-maturing vegetables.
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