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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

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.
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.
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.
30 Apr 18, Sandy (New Zealand - sub-tropical climate)
I sowed my watermelon in mid summer and it's still growing. I'm wondering if it will actually fruit in Auckland this time of year. Should I leave it or remove and try again next summer?
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.
08 May 18, Andrea (New Zealand - temperate climate)
It's frustrating, because the growth is promising, but it won't ripen any fruit that form in the cold weather. Rip it out and start again in spring : )
29 Nov 17, Toni (New Zealand - temperate climate)
Has anyone growen watermelons in Wellington?
Showing 1 - 10 of 16 comments

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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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