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Growing Watermelon

(Cucurbitaceae c. lanatus)

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


  • Harvest in 68-100 days
  • 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.
  • Space plants: 60-75cm

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

02 Oct 12 Patsy Vermunt (New Zealand - temperate climate)
I have started my seeds in jiffy pots here hoping I live in te awamutu waikato
03 Oct 12 Dawn (New Zealand - cool/mountain climate)
My watermelon seeds have just sprung throught the dirt...are they better growing in a hot house? or is it ok to transfer them outside?
06 Oct 12 (New Zealand - temperate climate)
Dawn, It's probably best to keep them under cover until the weather has settled into warmer temperatures.
20 Nov 12 Lara (New Zealand - temperate climate)
Haydn, all the reading I've done suggests it IS possible to grow watermelons in pots so I am trying it for the first. Keys to successful growth in pots appears to be plenty of nitrogen so blood and bone or sheep pellets. Also pollination can be tricky if there is nothing around the plants to bring bees in. And once you have the fruit set you will need to support the fruit if you have it growing up trellis. Good luck!
01 Jan 13 Rosscoe (New Zealand - temperate climate)
I have two water melon plants currently growing in my greenhouse. They are doing fantastic and both out of approx 340mm pots. Due to a possible lack of insect entering the green house I have manually pollinated a few of the females to make sure. I currently have one water melon on each plant and am aiming for one more on each. I just keep topping up the tray now that they are growing fruit so they always have water access.
14 Feb 13 Menaka Mahajan (New Zealand - sub-tropical climate)
Hi I planted a watermelon plant in my garden in Oct last year. It has just about started growing tiny watermelons now. Will the watermelons sustain the temparature drop from high 20s to low 20s. What can I do to ensure that they mature well?
13 Mar 13 Paul (New Zealand - temperate climate)
Hi guys, could you please give me an indication as when Watermelons should be at the best price, I remember last year it was around this period but not certain. Thanks
01 Oct 13 Sarah (New Zealand - sub-tropical climate)
Hi. I'm new at planting watermelon. I've just put seeds into tray and will plant out. Once they are outside and growing, will I need to feed them a lot or just as much as other veges/fruit. Just being watermelon I thought they may require a lot more water.
16 Jan 14 Brian Pattison (New Zealand - sub-tropical climate)
Hy, I have been trying for 3 years and have no luck,the vines get to about 1m long and that is it,they have had some flowers,I grow from seed,and have bought plants,but still nothing.Any ideas Please. I live in Little waihi South of tepuke In the BOP NZ
28 Jan 14 Debby (New Zealand - sub-tropical climate)
Hi,this is my first year at growing watermelons.Our dirt is clay so my husband dug a hole and put a mixture of compost and potting mix in there.I planted one plant and now have seven watermelons growing,One is the size of a sm.soccer ball and the others just larger than tennis balls

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New Zealand - cool/mountain,   New Zealand - sub-tropical,   New Zealand - temperate  

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