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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
    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

22 Nov 17, Heather (Australia - temperate climate)
I have zucchini growing well but they are starting to go bad at the end where the flower is attached - this is when the flower has wilted but has not fallen off. Should I knock the flowers off when they have wilted?? many thanks for your advice
21 Nov 17, Hannah (New Zealand - temperate climate)
Hello, I am new to growing vegetables in general, and am really enjoying it. I recently planted three courgette plants, and did as instructed on the label which was to plant on a raised bed. They are not looking 100% happy at the moment, drooping a bit and some of the leaves are bit burnt/brown around the edges. I was wondering on some good tips for growing courgettes? And how often I should be watering them? Thanks. H
19 Nov 17, Phil (Australia - temperate climate)
I have some zucchini planted alongside a bed of sweet potato and have just read zucchini should not be planted alongside potatoes! The potato bed is secure in a raised bed. Please advise the issues? Regards................
20 Nov 17, Mike (Australia - cool/mountain climate)
Potatoes are said to inhibit the growth of Zucchinis etc. Ever want to know - google google google lol
09 Nov 17, Dale (Australia - sub-tropical climate)
I have planted 2 zucchini seeds close to each other and about 60 to 80 cm further on another 2 seeds close together.( as they say to plant 2 or 3 seeds in a clump and then keep only the healthiest one) Well , 2 came up so healthy ,right next to each other, and I don't want to pull out one and throw it away...can I re plant it or just leave it there (about 3 or 4 weeks old) The other 2 don't look as healthy,(not sure why that is .)
10 Nov 17, Mike (Australia - sub-tropical climate)
It might be a bit late to transplant now - you will really set it back by transplanting it. Next time don't plant them so close. When you transplant always try and have soil around the roots. Leave it there but keep the water up and maybe a touch of fert in a couple of weeks.
08 Nov 17, Lizzy Miller (Australia - temperate climate)
Hi there my ? is can I cut the underside leaves from a productive plant, as the are becoming intrusive on my herb garden. Thank you. Cheers Lizzy.
10 Nov 17, Mike (Australia - sub-tropical climate)
Yep cut them.
07 Nov 17, Cherie (Australia - sub-tropical climate)
I am growing a yellow zucchini variety, mulched and composted. Trying to be consistent with the water but it's hard in the stormy weather here in Bris. Plant looks healthy and happy and fruiting well, but none make it to edible size as they get squishy and brown at the flower end (Blossom end rot?), When I break them off and open there are maggots inside... Any experience and ideas to fix this issue, not the first year, or variety, I've had this problem, though the worst it's been.
08 Nov 17, Mike (Australia - sub-tropical climate)
A couple of things. 1. Zucchinis need bees to pollinate or you have to do it by hand ( break off a male flower and peal the flower part back and rub the female flower). 2. You need both male and female flowers to be able to pollinate (sometimes there is all male flowers and sometimes all female flowers - happened to me this year). 3. Wet weather brings moths grubs and disease - water down low around the plants and not on the plant - also if watering the plant do it in the morning so it dries out before night. 3. With the storm season happening it is probably too late for zucchinis now. A thing for blossom end rot is some Epsom Salts - google about doing it - it works for tomatoes. By this time of the year I normally have all my plants harvested - summer too windy, too hot and chance of wrecking storms - like last night - Bundaberg.
Showing 1 - 10 of 236 comments

When is the last month to grow zucchini?

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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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