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Growing Zucchini, also Courgette/Marrow, Summer squash

Jan F M A M J J A S O N Dec
      P P P P P        

(Best months for growing Zucchini in Australia - tropical regions)

P = Sow seed

  • Grow in seed trays, and plant out in 4-6 weeks. Sow seed at a depth approximately three times the diameter of the seed. Best planted at soil temperatures between 21°C and 35°C. (Show °F/in)
  • Space plants: 50 - 90 cm apart
  • Harvest in 6-9 weeks. Cut the fruit often to keep producing.
  • Compatible with (can grow beside): Corn, beans, nasturtiums, parsley, Silverbeet, Tomatoes
  • Avoid growing close to: Potatoes
  • a) seedlings
    a) seedlings
  • b) Six or seven weeks old
    b) Six or seven weeks old
  • Zucchini flower
    Zucchini flower

Plant into a slightly raised, well composted bed and mulch. Needs regular plentiful water. Produces large leaves with a spread of about 1.5m x 1.5m. Some varieties trail a bit but don't climb. The yellow (or gold) variety is more resistant to mould damage in humid areas and remains productive even when the leaves have mildew on them. The yellow varieties sometimes have yellow patches on their leaves but it is just colour not disease.

Blackjack is the most popular green variety. At the start, the plants produce mainly male flowers. The female ones start as the weather warms up and the plants grow. A spray with a 5gm/teasp Bicarbonate of Soda in 600ml/pint of water will help slow powdery mildew when it appears.

Culinary hints - cooking and eating Zucchini

Zucchini are best picked or cut off the stem at about 15cm / 6 inches.
Pick frequently to keep the plant producing new flowers.

Your comments and tips

05 May 18, Dale (Australia - sub-tropical climate)
I have just bought some blood and bone , Can I dig in a little around my 6 week old zucchini plants ,then water it in?
07 May 18, Mike (Australia - sub-tropical climate)
Yes - a light raking around the plant and water it in.But next time when preparing the soil add a bit a week or so before you plant. When preparing my soil I now put the following on. Some compost/mulch, lime, trace elements, some extra phosphate, some Epsom salts and some worm tea. Then when plants are well established I put some watered down fertiliser (N P K) if I think it needs it.
08 May 18, Dale (Australia - sub-tropical climate)
Thank for that info Mike...I will get on to it now.I really want this lot to make it to the table..ha ha...Blessings to you.
10 May 18, Mike (Australia - sub-tropical climate)
Check to see if you have bees working in your area/garden otherwise you might have to hand pollinate in the mornings when the female flowers come out. they are only open for a 1/2 day.
08 Jan 18, Tony Barnes (Australia - temperate climate)
Planted my zucchini early in raised beds. Brilliant start looked good producing well. Then these and later plantings have started well but the leaves get a shrivelled look around the edges and only male flowers are produced. When I pull these plants out the roots are quite rotten looking. Am in Northern Rivers area NSW so very humid with warm/hot winds.
09 Jan 18, Mike (Australia - sub-tropical climate)
Try growing from Sept - as you say hot and humid now.
26 Dec 17, Steve (Australia - tropical climate)
All about the soil, my plants are the size of seven week old plants. Try a mix of compost, coir, perlite and tomato mix.
04 Dec 17, Robert (Australia - temperate climate)
I have 2 plants that are growing well, I have one zucchini that matured,but now the small fruit are turning yellow before the flowers open and fall off. Any advice please.
08 Dec 17, Fred (Australia - sub-tropical climate)
Mix one cup of milk to 2 litters of water and put 2 cups of the mixture into the base of each plant. And you need to use this lime sprinkle two hand full around the base of the plant before watering.
08 Dec 17, Fred (Australia - sub-tropical climate)
Dolomite lime. It's a good source of calcium. For some reason the link in my previous reply was deleted.
Showing 1 - 10 of 207 comments

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This planting guide is a general reference intended for home gardeners. We recommend that you take into account your local conditions in making planting decisions. Gardenate is not a farming or commercial advisory service. For specific advice, please contact your local plant suppliers, gardening groups, or agricultural department. The information on this site is presented in good faith, but we take no responsibility as to the accuracy of the information provided.
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