Growing Watermelon

Cucurbitaceae c. lanatus : Cucurbitaceae / the gourd family

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

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

  • 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
  • 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

08 Aug 22, Catherine E Villarreal (USA - Zone 10b climate)
When can I plant seedless watermelon seeds in zone 10b
02 Aug 22, rhonda (USA - Zone 9a climate)
It is now the beginning of August 2022 and I was wondering if it is possible to grow watermelons from seed in grow zone 9a (Houston Texas) if I grow them in a giant pot and keep it in a shady area of my yard out of the extreme heat we are experiencxing now in Texas? I planted some seeds (direct seeded into the top of a compost pile I have in direct sunlight) they did germinate into very small seedling plants, but because the weather was hitting over 100 degrees they immediately died back. So I am attempting to grow some in a large pot and keeping them out of direct sunlight and seeing if they will continue growing, if so I will try to grow them vertically on a trellis. Has anyone else ever attempted such a experiment? If so, were they successful in getting a watermelon to grow out of season?
08 Jun 22, Marlow (USA - Zone 9a climate)
I seem to have bottom rot on my watermelons. Two out of 3 are effected. I've read that it's because the soil is lacking calcium. I'll be getting a soil tester tomorrow to check the pH. What would be the best thing to add calcium to the soil? I just don't know if that would work or if I should start new seeds and plant in an area that already has the pH suitable for watermelons...
17 Jun 22, (USA - Zone 4a climate)
Probably too late now but use Epsom Salts - scatter some of this in your soil in future especially where you plant the seeds.
13 Jun 22, Sarah (USA - Zone 9b climate)
Maybe adding eggshells to the soil will help
26 Apr 22, Noelle (USA - Zone 10a climate)
Spacing for vertical watermelon growing? I have a 2x4 bed and planted watermelon on opposite ends on one side (Sugar Baby variety) and one on the center on the opposite side (Crimson) with the goal of having them grow vertically. I only expected three plants total but planted more seeds since these were older seeds. I now have eight watermelon plants that are growing beautifully. I don't want to thin, but I'm sure it's necessary. Any advice on spacing for vertical growth? I've read all sorts of different suggestions online.
09 Mar 22, Trish Deeter (USA - Zone 10b climate)
What are the best seeds to purchase for Zone 10b, Costa Mesa, Southern part of California near the ocean?
04 Sep 21, Harrison Brown (USA - Zone 10b climate)
I would like to know what type of fertilizers I can use to fertilizer my pigeon peas, corn, and watermelon plants?
07 Sep 21, (USA - Zone 4a climate)
A general garden fertiliser will do.
21 Aug 21, Sandra Carlton (USA - Zone 8b climate)
I have watermelon plants all over the garden lots of blooms but no fruit yet, they were planted mid July. In zone 8
Showing 1 - 10 of 33 comments

A general garden fertiliser will do.

- Anonymous

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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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