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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

Your comments and tips

17 Sep 18, Mike (New Zealand - temperate climate)
Plant earlier. If no fruit developing when it starts flowering check for bees. Should have fruit developing by 10-12 weeks. Hand pollinate if no bees.
11 Oct 18, Jo (New Zealand - temperate climate)
Planted watermelon seeds late last summer,didnt grow. Now they are sprouting but stem red colour after second leaf. Is this normal?
12 Oct 18, Mike (Australia - sub-tropical climate)
Best tasting melons are grown in the spring here. I don't know about the red stem stuff. They will start picking them here in about a months time. I LOVE EM.
22 Oct 18, Tracy smith (New Zealand - temperate climate)
I have done watermelon seeds in September month & they have come up & r doing well so har. When is the best time to plant them in the ground they r about 1 inch high each I have 4 of them
23 Oct 18, Mike (New Zealand - temperate climate)
When they have produced a good root system. Wait until they have several leaves. Important to keep as much soil in contact with the roots as possible when planting out. Try and protect them from the sun for the first week. In future plant in a little pot like a 500 gm margarine container with a few holes in the bottom to let water drain out. When they are about 3-4 weeks old plant out. If no frosts you can plant directly into the soil.
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.
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
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.
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.
Showing 11 - 20 of 25 comments

Planted watermelon seeds late last summer,didnt grow. Now they are sprouting but stem red colour after second leaf. Is this normal?

- Jo

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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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