Growing Zucchini, also Courgette/Marrow, Summer squash

Cucurbita pepo : Cucurbitaceae / the gourd family

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

(Best months for growing Zucchini in Australia - sub-tropical regions)

  • S = Plant undercover in seed trays
  • T = Plant out (transplant) seedlings
  • 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

Your comments and tips

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.
08 Nov 17, Matt (Australia - sub-tropical climate)
Zuchinni, pumpkin, rockmelon and such are now just starting. Early fruiting generally does not get pollinated as well as it does in a week or two's time. From your description your female fruit buds are not pollinated and then they rot and get infested with fruit fly larvae or similar. Try hand pollinating your female buds with a male bud at this stage in the season and this will secure fruit production. Strip the male buds covers and wiggle around the inside of a female bud, that will ensure pollination. Use your finger in soil if it comes out with material on it don't water, if not, water well once every 3 days. Regards Matt
10 Nov 17, Cherie (Australia - sub-tropical climate)
Thanks for that info. I'm thought pollination was occurring, as the fruit starts growing well, doesn't that mean it has been pollinated? The fruits are about 5cm long when they go soft and squishy at the end. We do have bees around...
13 Nov 17, Mike (Australia - sub-tropical climate)
When the female flower comes out, the little zucchini grows to about 5 cm long in the first few days. If it is not pollinated, it then shrivels up or goes rotten in the end. You may have bees, but you need to look to see if you have all female flowers - or all male flowers. My zucchini crop - at the start they were mostly male flowers and at the end just about all female - 1 male 20 female.
24 Sep 17, Sarah (Australia - temperate climate)
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?
22 Oct 17, Jason (Australia - temperate climate)
I'm also in Perth, and I've found that used coffee grounds work well to kill snails. Caffine is toxic to snails and slugs but worms seem to love it and it won't harm pets (they don't want to eat used grinds)
25 Sep 17, Darren (Australia - temperate climate)
Try plastic milk bottles cut in half over the seedlings overnight. Also large pieces of orange peel, large enough for the snails to hide under, can help catch them.
24 Sep 17, Mike (Australia - sub-tropical climate)
Try starting them in a controlled area. In seed raising punnets - or any container -like an old used butter container, small pots etc. Use some light soil or potting mix. Put the containers in a box or tub and cover if you have to. Grow them for a few weeks like this and then plant out. Look up how control snails on the web. See if you can get some bird netting or something similar.
19 Aug 17, Kathy Mc (Australia - temperate climate)
I have red capsicum, blackjack zucchini and burpless cucumber. I planted a Dwarf eggplant in a pot. can I plant the others in a raised garden bed now.. Thanks for your help
Showing 71 - 80 of 255 comments

I've noticed with pumpkin (and I asdyme zucchini) they basically have to be pollinated from another plant of the same species. Make sure you buy 2 or 3 plants. I tried several years just having 1 pumpkin plant and hand pollinating itself, with pollination always failing. Now I usually hand pollinate zucchini and pumpkin in mornings by taking the male flower from one and pollinating the female flowers on other plants and vice versa. It worked really well last season and seems to be working well this year with blackjack zucchs.

- Jason

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