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 7a 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

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...
13 Jun 22, Sarah (USA - Zone 9b climate)
Maybe adding eggshells to the soil will help
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.
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 Aug 22, Catherine E Villarreal (USA - Zone 10b climate)
When can I plant seedless watermelon seeds in zone 10b
04 Sep 22, (USA - Zone 10b climate)
March or Aug Sept
30 Apr 23, Sam (USA - Zone 10a climate)
I’m in zone 10a Rialto ca and I’m wondering if it’s too late to start my watermelon seedling this is my first time ever planting something and I have many many many seeds of multiple vegetables and I have no idea when to start my seeds
08 May 23, Anonymous (USA - Zone 6b climate)
Each vegetable here has a planting guide for each climate zone. Find your zone in the top bar and check the planting calendar for watermelon.
26 May 24, Lee (USA - Zone 10b climate)
I am in zone 10a & 10b. Last year I started my watermelons on memorial day, not intentionally, and they grew really well. Today is memorial weekend and I'm planting mine now. I wouldn't say wait on purpose, I just moved so I had to wait, it never hurts to try. Because it was so late in the year, last year, I only planted 6 watermelon seeds in the ground and 5 produced. 4 of them had 4 watermelons and 1 of them had 3. I feel like these areas are capable of growing things almost year round regardless of the suggested planting time.
04 May 23, juan perez (USA - Zone 10a climate)
melons do they grow on the ground or trails
Showing 31 - 40 of 44 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. 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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