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
                    P P

(Best months for growing Watermelon in New Zealand - cool/mountain 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

17 Nov 15, Kgabo Simon (South Africa - Summer rainfall climate)
Hi All, I would like to know where i can purchase watermelon in Lephalale Limpopo. Please send me the name of the farm and contact details Thank You
31 Aug 15, TIISETSO TSUELLE (South Africa - Semi-arid climate)
Which fertilizer may i us to the soil before i plant watermellon OR is kraal manure (cow dung ) correct to use?
11 Aug 15, TIISETSO TSUELLE (South Africa - Dry summer sub-tropical climate)
When to plant for december harvest? Distance between plants?
08 Aug 15, Peter du Preez (South Africa - Semi-arid climate)
The soil here is extremely sandy so we make compost and loosen the soil (basically make a hole for seedlings and enrich it with 300ml of compost). I've never planted watermelons and would like to (cabbage and radish work wonderfully here). What irrigation is better - overhead or drip? How much water per day/week? (we plant without wastage). Is it okay if I use mulch - we do it for everything else to preserve the soil. It gets to about 45C in summer... is that okay?
05 Jun 15, Stig (Australia - temperate climate)
It could be a pie melon . My mum use to make pineapple and melon jam .... very nice (google the recipe .. very easy to make) cheers Stig
04 Jun 15, robert (Australia - sub-tropical climate)
i found some plants along a train line that have fruit that looks just like watermelon on the outside and inside it is greenish but still smells and tastes like watermelon so what is it and if i got seeds from the fruit will it grow
05 Jun 15, Marcel (Australia - temperate climate)
Wouldn't be able to confirm with out a photo but it's probably paddy melon. It's a weed and it grows through out Australia and California. The fruit and foliage are toxic due to it containing cucurbitacin (so stop eating it). It's been responsible for a lot of live stock deaths through out australia. But if you want to grow it for ornamental reason it will positively grow from seeds. Be warned but, it is extremely invasive and will easily take over your garden. It's only real use for humans has been as an emetic. Have fun haha Happy days
30 Jan 15, Mohamed (South Africa - Semi-arid climate)
Good day I would like to know where to purchase watermellon seeds from South Africa. I used To buy for Mozambique but now in Saudia Arabia .i know that South African seeds are good . Thank you
18 Aug 14, mart (Australia - tropical climate)
I'm growing champagne watermelons, with the fruit now at the size of a baseball, but the leaves are starting to wilt and as its a sandy area and the ground seems to stay wet, I'm wondering if it's to wet.
23 Jun 14, tony davoren (Australia - tropical climate)
What diseases are prevalent in melons in the katherine area northern territory and how do you test for them ?
Showing 231 - 240 of 350 comments

Is July too late to plant or transplant? Or should I wait for August. Wanted to get a plant or seeds as a late Father's day gift but thought I should ask. It can always get a birthday present in August

- NSyed

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 GardenGrow 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 GardenGrow and subscribe to the free GardenGrow planting reminders email newsletter.


Home | Vegetables and herbs to plant | Climate zones | About GardenGrow | 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. 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.
We cannot help if you are overrun by giant slugs.