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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

18 Nov 19, Bickie Mbenge (South Africa - Summer rainfall climate)
Hi Which sweet large watermelon do you recommend for me. I want to start watermelon farming. Please recommend seeds name. Regards
19 Nov 19, anon (South Africa - Summer rainfall climate)
I suggest you phone your agricultural department and ask. Generally it comes down to what kind of melon you want to grow, seeded, seedless, big, small. Check out a few internet seed selling companies also and read up about the different varieties.
16 Nov 19, Anne Hay (Australia - temperate climate)
What sort of of soil should be used for growing watermelon. Should they be grown in the sun or shade and what do you feed them please.
18 Nov 19, Another gardener (Australia - sub-tropical climate)
Any reasonable soil just not heavy clay soil. In the sun and any general vegie fert. If you prepare your soil well before planting by adding compost, manures, organic fert, inorganic fert, then that is enough to grow the crop. I have never used any of these soil enhancing products. If you grow pretty good crops without them why waste money putting all that stuff on.
06 Nov 19, Imran Mbongzee (South Africa - Summer rainfall climate)
Hello please can I plant watermelon in December am in jhb
12 Nov 19, Another gardener (South Africa - Summer rainfall climate)
Hi I'M from Australia. I comment on Aust and NZ Gardenate questions. This website tells you when to plant and provides information about growing the crop. If there is not enough info here go onto GOOGLE and search. Check the calendar about when to plant - it is that simple. Or find a plant on the Vegetables and herbs tab. (Find your zone on the Climate zone tab, then make sure that is showing at the top of the plant page to get the correct information for your area)
04 Nov 19, (Australia - sub-tropical climate)
What fertiliser do you use and where do you put it. Also how often do you water?
05 Nov 19, (Australia - sub-tropical climate)
It is best to prepare your soil and add the fertiliser (compost, manures, in-organic fert , organic fert) when preparing it unless you want to use these soil enhancers that have very little NPK.
05 Nov 19, anon (Australia - sub-tropical climate)
Most veges just need an all round fertiliser. Leafy veges a bit more N, fruity/root veges a bit more P/ K. Read up about what N P K does in the soil. that will determine what you put on. But it is impossible to go and buy 20 different fertilisers for 20 different plants. I buy the same fertiliser to fertilise all my vegetable, lawn and shrubs. Also look at crop rotation. A leafy crop will take the N out, so you might plant a root crop after. When plants are very small they need a light watering each day, as they grow you can water less often but put more water on. Plants half grown need watering each 2-3 days. The amount depends on how big that plant grows. You would water lettuce a lot less than 1.8m high tomatoes. I water 3 days a week.
23 Oct 19, Dumi (South Africa - Summer rainfall climate)
Hi. I am in Herkpoort, in the South of Johannesburg. Can I plant watermelons late November? Where can I get seedlings in GAuteng.
Showing 1 - 10 of 237 comments

Any reasonable soil just not heavy clay soil. In the sun and any general vegie fert. If you prepare your soil well before planting by adding compost, manures, organic fert, inorganic fert, then that is enough to grow the crop. I have never used any of these soil enhancing products. If you grow pretty good crops without them why waste money putting all that stuff on.

- Another gardener

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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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