Growing Watermelon

Cucurbitaceae c. lanatus : Cucurbitaceae / the gourd family

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

(Best months for growing Watermelon in USA - Zone 10b 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 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

Your comments and tips

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.
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
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.
28 Mar 23, Martin (USA - Zone 10a climate)
Hey how did those watermelons turn out. I'm thinking about growing rhem vertically
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?
Showing 11 - 20 of 47 comments

Ask a question or post a comment or advice about Watermelon

Please provide your email address if you are hoping for a reply


All comments are reviewed before displaying on the site, so your posting will not appear immediately

Gardenate App

Put Gardenate in your pocket. Get our app for iPhone, iPad or Android to add your own plants and record your plantings and harvests

Planting Reminders

Join 60,000+ gardeners who already use Gardenate and subscribe to the free Gardenate planting reminders email newsletter.


Home | Vegetables and herbs to plant | Climate zones | About Gardenate | Contact us | Privacy Policy

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.
We cannot help if you are overrun by giant slugs.