Growing Watermelon

Cucurbitaceae c. lanatus : Cucurbitaceae / the gourd family

Jan F M A M J J A S O N Dec
      S S              
        T T            
        P P            

(Best months for growing Watermelon in USA - Zone 5a regions)

  • S = Plant undercover in seed trays
  • T = Plant out (transplant) seedlings
  • P = Sow seed
  • 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

02 Oct 22, Charles (South Africa - Semi-arid climate)
I want to know how best l can grow water melons in Summer under irrigation.
03 Oct 22, (South Africa - Semi-arid climate)
Irrigate regularly. 2-3 times a week. Small amounts when plant are small then increase the water as they grow.
02 Aug 21, Thembisile (South Africa - Summer rainfall climate)
Where can I buy watermelon seeds? I'm in Swaziland. Thanks
01 Mar 24, Gagu (South Africa - Semi-arid climate)
You can buy seeds at SAS in Manzini,Nami ngiwatsenge khona
03 Nov 23, Bee-Pie (South Africa - Humid sub-tropical climate)
Try www.livingseeds.co.za
19 Aug 21, Dipolelo (South Africa - Summer rainfall climate)
I kept few seeds from a watermelon I enjoyed in January. I'm going to plant them next month. I'm so looking forward. I'm in GP.
06 Aug 21, Anon (South Africa - Semi-arid climate)
try an agricultural shop.
09 Mar 21, Sonke (South Africa - Humid sub-tropical climate)
Is it possible to plant or sow seeds in my region now in March ,Humid subtropical region..
10 Mar 21, (South Africa - Humid sub-tropical climate)
Check the monthly planting guide here. Better to plant in the spring.
21 Oct 20, Modiba matee john (South Africa - Summer rainfall climate)
HI which watermelon variety or hybrid is larger and sweet?
Showing 11 - 20 of 82 comments

Water melons must have been invented for rank amateurs. I live in Coconut Grove, Darwin, NT and have zero gardening experience, but decided to plant some water melon seeds (in pots) at the end of October - build up time to our summer wet season. They germinated fast so out into the garden they went with a lot less ground preparation than there could have been. They grew, started producing flowers (male only for quite some time) so I kept watering them with the odd bit of general purpose soluble plant food. I haven't seen any diseases so they haven't been sprayed - apart from the termite man's overspray with he did my house's annual ant and spider treatment. Then, in early December, growth went up a few notches; I could see how far a vine had grown in a day. They started taking over the garden. Flowers appeared everywhere, as did tiny native bees to attend to pollination. Every few days a small watermelon appeared and quickly got bigger. At that point I sought some advice from a local garden shop on what I should be doing; they told me to keep watering and sold me some organic fertilizer pellets to feed them with. Now they've taken over the garden, have started climbing fences and keep on producing new melons. I'd never have imagined it could be that easy.

- Grahame B

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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. Gardenate 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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