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Growing Zucchini, also Courgette/Marrow, Summer squash

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

(Best months for growing Zucchini in USA - Zone 5a regions)

S = Plant undercover in seed trays 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 70°F and 95°F. (Show °C/cm)
  • Space plants: 20 - 35 inches 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
  • b) Six or seven weeks old
  • 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

27 Nov 18, David (Australia - temperate climate)
Of my 4 zuchini plants brought as seedlings only one has green fruit the other 3 have an abundance of fruit but they are more a pale white colour, are they still okay to eat.
27 Nov 18, Mike L (Australia - sub-tropical climate)
Go to website like Boondie seeds and look at the different varieties of zukies. You should be able to eat them. Probably they are a hybrid and they have thrown back to parent in the cross. Do you remember the name of them?
06 Nov 18, [email protected] (Australia - tropical climate)
Do l need to plant 2 zucchini seedlings for them to produce fruit? Thanks Judi
08 Nov 18, Mike (Australia - sub-tropical climate)
The plant will have male and female flowers. If no bees in your area hand pollinate in the morning. Look up the internet how to do it.
27 Oct 18, (New Zealand - cool/mountain climate)
When planting seeds, which end of the seed should be facing the surface?
27 Oct 18, Cesare Stella (New Zealand - cool/mountain climate)
I never bothered, I just lay them down
17 Oct 18, Gill (New Zealand - cool/mountain climate)
I have sown 2 sorts of courgette. The older seed (Italian) germinated as normal. The new seed purchased this spring has done nothing (the common yellow). At this stage seed pots are indoors
23 Oct 18, Mike (New Zealand - temperate climate)
Check to see if the seeds have rotted or not. Maybe they need a little sunlight to germinate.
19 Sep 18, Bess (New Zealand - temperate climate)
Is it advisable to pinch out the growing tips to stop the plants from getting too big? Thanks!
20 Sep 18, Mike (Australia - sub-tropical climate)
NO!!! The longer it grows the more zeeks you pick.
Showing 1 - 10 of 280 comments

I have just planted zucchini and cucumber I'm in Perth and the snails are eating the seedlings before they are even given a chance to start growing I have beer traps and have put egg shells around the seedlings it hasn't stopped them does anyone have any other ideas?

- Sarah

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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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