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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 70°F and 95°F. (Show °C/cm)
  • Space plants: 24 - 30 inches 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

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
02 Jan 19, Mem (New Zealand - temperate climate)
Hi I grow watermelons and other melons in pots every year,it can certainly be done but the melons won't be as big.You will also need to take care that the soil doesn't dry out,but isn't soaked and to feed often.I add blood and bone,sheep pellets and worm castings to a mix of 50/50 compost and potting mix to the pot,use a curcubit feed once a week and a general liquid feed every 2 weeks.
21 Dec 18, Mike (New Zealand - temperate climate)
Plenty of people might do it but I wouldn't grow such a big plant in a pot full stop, no matter how big the pot. The nutrient and watering required. Think about raised garden beds with something between the ground and the bottom of the bed like wood pallets. Pallets on the ground - then weed matting and shade cloth - then small stones maybe - then garden soil about 5-600mm deep. Probably quite expensive but is probably the best solution. Could start small and add to the size of the bed/s in future years. Otherwise stick to growing small plants in pots.
23 Oct 18, Debra (New Zealand - temperate climate)
wanting to grow melons this year, I am in North Canterbury any hints for success welcome, am I too late to sow seed ?
25 Oct 18, Mike (New Zealand - temperate climate)
Have a go. Probably need plenty of water later. If not very successful, plant earlier next year - early Sept.
Showing 1 - 10 of 25 comments

If you pick a watermelon early and its greenish, is there any way to ripen it up without throwing out to the chickens

- Cherry

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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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