Growing Sweet Potato, also Kumara

Ipomoea batatas : Convolvulaceae / the morning glory family

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

Not recommended for growing in USA - Zone 5a regions

  • Plant shoots or cuttings (Slips). Best planted at soil temperatures between 17°C and 35°C. (Show °F/in)
  • Space plants: 40 - 60 cm apart
  • Harvest in 15-17 weeks.
  • Compatible with (can grow beside): Best in Separate bed
  • New shoots on Kumara
  • Well grown Kumara

Sweet Potatoes require a long warm growing season. Plant in free draining loose soil. Fertilise before planting but no more when the plants are growing as it will encourage vine growth. They will go for miles and you will get no tubers. If they do start spreading, lift the vines off the ground to prevent them rooting.

Mound up the soil about 20 cm (8 in) before planting. Let the plants die down, (leaves die or turn yellow) before harvesting the tubers. Dry them in the sun for a few days. then store in a cool dry place for up to five months.

Culinary hints - cooking and eating Sweet Potato

Use mashed, boiled, roasted, baked or fried. Or use in soups, pies, casseroles, curries and salads.

Your comments and tips

10 Feb 10, Sandra Rowland (United Kingdom - cool/temperate climate)
Is it possible to grow sweet potatoes in the uk?
01 Jan 13, Jane (United Kingdom - warm/temperate climate)
I didn't think so, but I read on the blog of a Canadian gardener how she had a massive crop last summer, so I'll have a try this year. She cut the sweet potato in half and suspended it with the end in water until it grew shoots, then twisted the shoots off and planted them once all danger of frost was past. She also warmed the soil with black plastic.
24 Jul 09, Mel (United Kingdom - cool/temperate climate)
I'm looking for Maori potatoes in the UK can anyone suggest a source please ? Thanks
09 Apr 09, Anneliese (United Kingdom - cool/temperate climate)
how do you know if the sweet potatos are ready - mine have been in the ground for 6 months now

Hi there :-) found this thread while looking for a diagram of kumara (sweet potato) and thought this info might help you Jason. In early Feb, had this awesome fella come show us how to plant kumara in the traditional way, used successfully by Maori before European colonisation. I recently emailed him asking for general care and cultivation tips... this was his reply: "Kia ora ano sis, chur mean, glad to hear the kumara are in abundance! Have y'all pulled the runners up yet? - about 3 weeks ago you shouldve pulled up the runners on a sunny day and exposed the roots to the sun for a few hours to kill them. Otherwise the plants direct energy away from the tubers and into setting down new roots via the runners and your kumara wont be as big as they could. If you havent done it yet, still do! At that point you can also start harvesting the new shoots of vine growth - pick leaves and vines that are still that brighter green and use it like puha or watercress. If you eat mature leaves it might upset your stomach so kia tupato! (you probably already know all this!). This has same effect of directing energy to the tubers." For your reference, "puha and watercress" are greens that can be added to salads or boiled/blanched similar to spinach and silverbeet and "kia tupato" means I need to "be careful" - eating mature leaves can be harmful! Well, I am off to pull up the runners and expose them to the sun! Glad there is some today :-) Good luck with the kumara growing!! "As the garden grows so does the gardener." - Proverb

- Starrlite

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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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