Keep your garden growing - see what to plant right now

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
    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

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!
10 Jul 18, Teri (USA - Zone 6a climate)
Should I cut back to make flowers to make females produce more?
07 Jun 18, Dale (Australia - sub-tropical climate)
Well I have got some beaut zucchini plants coming along and I have been caring for them.I even made sure they were all fertilized.But now there is something eating all the flowers.I can't see anything around. I did squash a couple of 28 spot lady bugs.HELP. Also something has eaten all of one of my cauliflower plants. I can't seem to win the war!.More HELP please.But... I am picking some snow peas,Hooray!
08 Jun 18, Mike L (Australia - cool/mountain climate)
Either go to a shop and buy a insecticide/spray for grubs etc for cabbage/caulies etc or look on the internet for an organic spray for them.
13 Jun 18, dale (Australia - sub-tropical climate)
Thanks once again Mike for your comment .I am going to give Eco oil a try. I like it, as is natural and organic and hopefully does the job.
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.
06 Apr 18, Gaynor (New Zealand - sub-tropical climate)
How can I grow zucchini’s in Auckland in the winter thanks.
Showing 1 - 10 of 270 comments

I posted here in the pumpkin section - the female flower only opens one day and is shut by mid afternoon. So the bees or you have a very limited time to pollinate the female flower. Zucchini pumpkin cucumbers are from the same family so maybe this applies to all these plants. If you don't have bees then you need to look each day to see when the female flower opens. It takes approx. 12 visits by a bee to pollinate a pumpkin female flower.

- Mike

Please provide your email address if you are hoping for a reply


All comments are reviewed before displaying on the site, so your posting will not appear immediately

Gardenate App

Put Gardenate in your pocket. Buy the app for iPhone, iPad or Android to add your own plants and record your plantings and harvests

Planting Reminders

Join 30,000+ gardeners who rely on Gardenate. Subscribe to our free planting reminders email newsletter


Home | Vegetables and herbs to plant | Climate zones | About Gardenate | Contact us | Privacy Policy

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.
We cannot help if you are overrun by giant slugs.