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 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

Your comments and tips

20 Mar 22, Graham (Australia - temperate climate)
I have grown trombone zucchinnis this year in amongst butternut pumpkins. Can anyone enlighten me as to whether they will cross pollinate.
26 Mar 22, Anonymous (Australia - sub-tropical climate)
yes they can.
22 Mar 22, Celeste Archer (Canada - Zone 7b Mild Temperate climate)
I think that your trombone will be ready to harvest in about 60 days (from seedling to harvest date - called a summer squash) -- and I think that butternut squash (pumpkins) take closer to 120 days (from seedling to harvest date - called a winter squash) ==> my best guess is they will not be flowering at the same time; so no cross pollination will occur. If for some reason you staggered the planting so they were to flower at the same time; my best guess is YES they can cross pollinate -- squash seems to cross pollinate with other squash easily....however, this is just a guess based on what I know about other squash.
22 Mar 22, John Mauger (Australia - temperate climate)
Tromboncino and butternut are both Cucurbitus moschato so would cross pollinate. As Cucurbits are pollinated by insects you would need to have a substantial distance between them (a few house blocks) to avoid this happening. If you want to save Tromboncino seed you would need to remove ALL of the male flowers off the butternuts as they appeared. The Butternuts would then be hybrid but the Tromboncino's should be pure. Check the botanical names of all pumpkins, squash, marrows, zucchinis, etc. before interplanting. If the specific name comes up with both, they will cross pollinate. Trust this helps
13 Oct 21, marco (Australia - tropical climate)
i brought 4 zucchini plants planted them around 4 to 5 weeks ago i harvest my first one yesterday .live on the gold coast qld .
03 Aug 21, Robert Perkins (Australia - tropical climate)
We have some healthy looking Zucchini Plants growing but unfortunately they are only producing female flowers. Not much good for fertilization. Can anyone give me a reason or solution to this problem ?
16 Oct 21, Jennifer S (Australia - temperate climate)
Be patient! The female flowers appear later in the season. I always plant 3-4 zucchini so that I have an abundance of flowers for pollination (which I do myself.)
06 Aug 21, (Australia - tropical climate)
I have had the same problem - all male flowers nearly - 3 different plantings - reason I have no idea.
22 Mar 22, Suzanne Irene (Australia - tropical climate)
Cucurbits produce lots of low energy male flowers for the first few weeks until a pollinator presence (bees usually) is established. Then, the females are produced. This is the pressure of natural selection. The ones that produce the most offspring dominate the gene pool. In this case later female flowering.
19 Dec 20, Genevieve (Australia - temperate climate)
I have been growing zucchini for past couple of years. Vines grow big ang healthy, the fruit grow to a couple of inches, and then begin to yellow, wither and die. I am not sure if it's lack of pollination or something else. I garden organically and while I have not planted flowers next to zucchinis there are flowers not too far away. Any clues, I'd love to hear. Thank you, in advance.
Showing 11 - 20 of 254 comments

I have grown trombone zucchinnis this year in amongst butternut pumpkins. Can anyone enlighten me as to whether they will cross pollinate.

- Graham

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