Select your climate zone What is my climate zone?

Growing Watermelon

(Cucurbitaceae c. lanatus)

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
                P P P P

(Best months for planting Watermelon in New Zealand - cool/mountain regions)


  • Harvest in 68-100 days
  • 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.
  • Space plants: 60-75cm

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

17 Oct 09 Trey (New Zealand - cool/mountain climate)
so when, where and how do I plant watermelon
04 Nov 09 FarmAway (New Zealand - cool/mountain climate)
It's best to start off in seed trays or seed cells and then transplant out. They do best undercover, eg greenhouse or tunnel house. I have been told that it's impossible to grow them outside in Canterbury, however I did manage to grow melons one year outside but transplanted through black plastic (weed mat would have been better because the water pooled on the plastic), which absorbs the heat. Be aware that watermelons are VERY frost tender.
07 Jan 10 shay (New Zealand - sub-tropical climate)
ive never grown watermelon before and im grown them n large pots has anybody being successful at doing it this way
26 Jan 10 vicky (New Zealand - cool/mountain climate)
place river stones around your young plants, then black weed mat over the top of the stones. The mat attracts the heat while the stones hold it and keep your night temp up. Placing comfrey leaves under stones also supplys nutrition for growing. I found natures curator a great aid also in the early stages in building plant resistance to disease. Patience is the key to fruit in the cooler regions of nz in my years of trying to get it right
20 Feb 10 Raewyn from Waikato (New Zealand - temperate climate)
My 6 yr old grandaughter put 15 watermelon pips into potting mix in wee containers indoors , once grown into wee plants we planted into the ground in January they are healthy and about 3 -6 inches high, have we left our run to late in planting now? we are Hamilton based, thanks
16 Oct 10 Shannel (New Zealand - temperate climate)
I am considering planting watermelon. I wonder since they send out long vines is it safe to just let the vines run over the grass if they go further than the garden/mat they're on?? Thanks!
21 Oct 10 Mark Carterton, Wairarapa (New Zealand - cool/mountain climate)
I've grown watermelon for the past couple of years here in Carterton. The vines do grow far, like pumpkin, but I carefully move the vines to more convenient locations if they go too far. Plenty of food, water and warmth and keep the wind off them if possible. As noted by Raewyn, you need to get as much of a start on the growing season as possible, otherwise (as we found out last year) the fruit, whilst large doesn't have time to mature properly on the vine.
09 Jan 11 Anne Harvey (New Zealand - temperate climate)
Why do the fruit not set after flowering?
16 Jan 11 teresa someeville (New Zealand - temperate climate)
we are grown watermelons for the first time and they are gown realy well,lots of flowers and fruit,but the vines are not very long.Does it take a while to grow.also do you water alot and do they need food.The frit that is grown is around the size of a tennis ball at the moment and im not doing alot just watern.we live near wanganui(north island)

Post a comment or tip about Watermelon


Where are you?



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

See planting calendar for these climate zones

New Zealand - cool/mountain,   New Zealand - sub-tropical,   New Zealand - temperate  

Home | Vegetables and herbs to plant | Climate zones | About GardenGrow | Contact us

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.

Site design and development by Hutchinson Software