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 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
  • 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. If there are no bees around and the fruit are not setting well or die off after starting to grow, try picking a male flower (straight stem) and gently brushing pollen inside female flowers.

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

26 Oct 16, bob (USA - Zone 7b climate)
where can i buy zepher squash
16 Jun 17, Delores Victory (USA - Zone 5a climate)
When is the last month to grow zucchini?
10 Jul 18, Teri (USA - Zone 6a climate)
Should I cut back to make flowers to make females produce more?
24 Aug 20, Dave (USA - Zone 9b climate)
I cannot seem to get my zucchini to grow. The leaves keep wilting and dying off and so do the sprouts from below. We have a raised compost garden with tomatoes and bell peppers. It has been VERY hot this summer so perhaps I should be watering more? At what times should I water to help the plants the most? Thank you in advance.
25 Aug 20, Anon (USA - Zone 9b climate)
Take a look at the top of the page at the monthly planting guide, plant Feb Mar April. A lot of vegetables are seasonal so plant at the right time to get the best results. When watering, water low on the edge of the plant not above the flower and do it in the morning. A good watering 3 times a week.
27 Aug 20, Dave (USA - Zone 9b climate)
Thanks! I'll follow that guidance. I suppose I might have to replant in the Spring then too :)

When is the last month to grow zucchini?

- Delores Victory

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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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