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Growing Zucchini, also Courgette/Marrow, Summer squash

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

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

S = Plant undercover in seed trays T = Plant out (transplant) seedlings P = Sow seed

September: Frost tender

  • 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

14 Aug 17, Marie Groizard (Australia - tropical climate)
Bindis just seem to be growing on our block, we have used all kinds of killers but cannot get rid of it.....what would you suggest? Thanks Marie
16 Aug 17, Mike (Australia - sub-tropical climate)
All spraying should be done when the weeds are small before flowering - early in the morning or late in the arvo - no wind. It is a waste of spray if the weeds are not in a growing stage - as in, if it has been dry for awhile. Plants need to be growing to be able to move the chemicals through the plant. Use some dishwashing liquid in the spray - helps to stick better to plant leaves. If in a lawn mow regularly before it seeds and mow lower than normal to gather more seeds up if seeded already. Use Kamba M or a Bindi and clover weedicide. Or pull it out by hand after rain or watering. Have to keep at it to get on top. "The trick to stopping bindii from spreading is to spray them in winter as soon as you see them, before the prickles develop, and continue to repeat spray every 3 weeks until they are gone. Repeat spray is important as this will control weeds that have germinated after prior spraying."
15 Aug 17, Alison Sizer (Australia - temperate climate)
Look at deep mulch no dig for at least a year. Plant mature seedlings into mulch. All weed seeds should die. Much will improve your soil. Thick layer of newspapers is critical.your goal is to eliminate light.
12 Aug 17, Marie Groizard (Australia - tropical climate)
Can I grow zucchini in Townsville from packet seeds...in a pot....in the shade or in a sunny spot, I have grown pumpkins and how and when should I prune a papaya tree, because I don't want it to grow too tall, it is fruiting at the moment and it is getting too tall for me to reach the fruit....when is the best time to prune. Thanks Marie
13 Aug 17, Mike (Australia - tropical climate)
The notes here say August is the latest month you can plant (too hot after that). Would have been preferable to have planted seeds 1-2-3 months ago. You could try seedlings - that would have you a couple of weeks ahead of seeds. Probably some shade during the middle of the day might help. Plenty of water at the root zone and not the leaves. Read the notes on this website for zucchini. I would say you have given your papaya trees too much nitrogen. I doubt if you can prune it. If you cut the top off it probably would die.
30 Dec 16, Chris (Australia - sub-tropical climate)
As soon as my zucchinis flower and produce fruit they quickly seem to die off, stop growing and die off before they are even 120mm long?
03 Jan 17, John Mauger (Australia - temperate climate)
Sometimes early female flowers don't set as they haven't been pollinated. It could also be water stress but I rather think the first. Give them a bit of time and they should settle down.
28 Apr 17, Shane hull (Australia - sub-tropical climate)
powdery mildew don't like alkaline environment. Milk is alkaline
29 Dec 16, Heather Price (Australia - temperate climate)
Hi My Zucchinni plans have a white covering over the leaf does this affect the plant.dio l need to treat it , if so what would l treat the leaf iwith
31 Dec 16, Yen (Australia - temperate climate)
Hi! I have the same thing in my garden I read about this treatment for white powdered mildew and it worked for me! Mix 1 teaspoon bicarbonate with 1 pint of water and water leaves that are affected. Hope it helps
Showing 1 - 10 of 171 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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