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 63°F and 95°F. (Show °C/cm)
  • Space plants: 16 - 24 inches apart
  • Harvest in 15-17 weeks.
  • Compatible with (can grow beside): Best in Separate bed

Your comments and tips

21 Nov 20, Len Lind (New Zealand - temperate climate)
I would like to try growing kumera here on Stewart Island in a tunnelhouse. Is there anywhere I can buy sprouts, slips?
18 Nov 20, Aitaua (New Zealand - sub-tropical climate)
Hi.. Can these sweet potatoes useful for planting here in Samoa?
19 Nov 20, (New Zealand - temperate climate)
They should be.
17 Nov 20, Henk Stengs (New Zealand - temperate climate)
I have experimented with kumara for several years in Greymouth with mixed success so last summer tried growing them in old car tyres. Their black colour absorbs heat thereby increasing soil temperature. Three sets of tyres were used, each stacked two high. These were placed inside our tunnel house on the surface in a sunny position and filled with soil, with one slip allowed to grow from each central position from late November. Harvesting took place in early April, producing a total yield of 9 kg, with about 60% of shop quality, my best result yet. When I harvested the tubers I saw that they were confined to centres of potential growth areas, with no root development at their circumferences inside the tyre rims. Therefore over half of the volume of soil in each pair of tyres was not utilised. This year I will plant 2 sllps per tyre pair, positioned diametrically opposite, with root ends inside the rims to see if this will give a better result. I am interested in hearing from anyone else who has tried growing kumara in tyres. .
18 Nov 20, (New Zealand - temperate climate)
They grow sweet potato/kumara where I live (Qld Australia) by the thousands of acres. They hill the soil up into rows about .5m high with a base probably .7m wide. They take pieces of vine (called a slip) about .4m long, strip most of the leaves off. Keep the growing tip on it. They place the whole slip just under the soil horizontally with the growing tip sticking out of the soil. Where each set of leaves were on the slip, roots will grow and potatoes will form. Water each day for the first 2-3 weeks. Just a side issue, tires may not be the best thing to grow vegetables in. Rubber compound/chemicals could leach into the soil.
20 Feb 21, Jay (New Zealand - cool/mountain climate)
Hi could you provide time of year for this method thanks
23 Sep 20, Elizabeth Gower (USA - Zone 10b climate)
Where can I get Kumara in the USA? I live in Southern Ventura County, Southern California and would like to grow some.
23 Sep 20, Liz (New Zealand - temperate climate)
You probably need to look for sweet potato
13 Sep 20, Adrienne (New Zealand - cool/mountain climate)
Can you plant an whole kumera in a container and get a crop?
14 Sep 20, Anonymous (Australia - cool/mountain climate)
Yes you can but you don't need a whole kumera, a piece of vine will do. A piece about 30-60cm long of the new vine growth. Place in a trench with the tip sticking out of the soil, water twice a day for the first 2-3 weeks.
Showing 51 - 60 of 309 comments

I live in the Redlands on the sourthern outskirts of Brisbane. I am trying to grow sweet potatoes for the first time. I have grown my own slips and planted them out and the vines are growing nicely. What I would like to know is where do the tubers grow from. Is it from the base of the slip or from the vines. Also I only have one vine growing from each plant. Do I need more than one vine and if so how do I encourage the extra vines.

- bernie

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