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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 = Plant in the garden.

  • 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
    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 Apr 17, Aloese Lefono (New Zealand - temperate climate)
Can they still grow and produce from April on?
07 Apr 17, John (Australia - sub-tropical climate)
By April, zucchinis and other members of the Cucurbit family (pumpkins, cucumbers, etc will be starting to die off. You may get a few more days that will ripen some of them but you are probably better to remove them and plant cabbage, cauliflower, etc or prepare the soil for broad beans. Check the page for your climate zone for other things to plant.
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.
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
03 Jan 17, John Mauger (Australia - temperate climate)
A 10% solution of milk and water also helps with powdery mildew. It is used organically, how it works, I don't know, but it does.
22 Dec 16, Melvyn Andrews (Australia - sub-tropical climate)
For the last three years I have failed in growing tomatoes. Despite spraying with recommended spray the worms/grubs get them. Last year I got one good one out of about 2 Kg. So this next year I am going to try Eggplant and Zucchini. Am I too late to plant now? What type of decease do they attract? If so,what can i do? Thanks from Sydney
23 Dec 16, John (Australia - temperate climate)
The grubs attacking your tomatoes will be fruit fly. They attack any fruit, including citrus. you could completely cover your plants with flywire or tuille netting
24 Dec 16, John (Australia - temperate climate)
Eggplant are probably also susceptible to fruit fly so cover them as you would tomatoes. I've not heard of fruit fly on zucchinis and they are heavy yielders of versatile fruit so they may be a good option. Trust this helps.
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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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