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Growing Watermelon

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

(Best months for growing Watermelon in New Zealand - cool/mountain regions)

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

  • 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: 60 - 75 cm apart
  • Harvest in 12-17 weeks.
  • Compatible with (can grow beside): Sweetcorn, Sunflowers
  • Avoid growing close to: Potatoes
  • Melon flower
  • Watermelon

Large, round or oval, smooth green skinned, delicious, sweet pink fleshed melon.

Some have stripes on the skin.

Some varieties will produce fruit up to 14 Kg (31 US pounds).

Harvest when the part in contact with the ground is turning yellow and the fruit sounds hollow when tapped.

Watermelon needs plenty of room to grow as it sends out long vines

Needs a long warm season to mature.

Culinary hints - cooking and eating Watermelon

Cut up and eat in slices.
Use to make fruit drinks.
Use in fruit salads.

Your comments and tips

26 Dec 19, Phoebe (New Zealand - temperate climate)
I have a watermelon growing and setting teeny baby fruit but they all wither and drop off within a week of setting. Any ideas?
30 Dec 19, anon (New Zealand - sub-tropical climate)
Sounds like you have no bees to pollinate the female flower. Do it by hand. (With a soft artist's brush or use a male flower)
15 Dec 19, Puiti (New Zealand - temperate climate)
Can I grow watermelon in Te Kuiti?
17 Dec 19, Liz (New Zealand - temperate climate)
You should be able to grow watermelon, if you start them early in pots or trays undercover. Have a look here www.gardenate.com/plant/Watermelon
16 Mar 19, alastair (New Zealand - temperate climate)
I am going to try growing them in a glasshouse with heated soil . Are there any varieties more suited to this approach?
07 Mar 19, Lea (New Zealand - temperate climate)
am in north canterbury, growing watermelon in glasshouse, didnt have success outdoors, but one in glasshouse has 5 melons of different sizes on it so hopeful , one getting quite large
10 Nov 19, Krystal (New Zealand - cool/mountain climate)
Hi Lea, I’m in Rangiora. I’ve got some beautiful watermelon seedlings growing. So glad I’ve come across your post as I was going to plant outdoors. How did your watermelon end up going in the glasshouse? Will you grow again?
06 Feb 19, Cherry (New Zealand - temperate climate)
If you pick a watermelon early and its greenish, is there any way to ripen it up without throwing out to the chickens
06 Feb 19, Mike (New Zealand - sub-tropical climate)
Read up about when to pick them.
20 Dec 18, Kams (New Zealand - temperate climate)
Hi there, I am here in Auckland and recently have shifted my watermelon plant to a 15 Litre Pot, one of the prime reason being our ground is full of roots and generally found it difficult in the past 2-3 years for other plants growing. Do you think it is ok to proceed in the pot and can connect vine to multiple stakes? Kindly advice. Thanks
Showing 1 - 10 of 29 comments

Hi. I am in Herkpoort, in the South of Johannesburg. Can I plant watermelons late November? Where can I get seedlings in GAuteng.

- Dumi

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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. GardenGrow 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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