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

24 May 17, John (Australia - temperate climate)
Australian Seeds in Western Australia list a native sweet potato - Ipomoea costata but I don't know of any suppliers of seeds of the popular varieties. They are grown from cuttings as they establish quickly and will yield in their first season. Seedlings would probably take another year.
23 May 17, love blue tongue (Australia - tropical climate)
how long will it take to grow
24 May 17, Ken (Australia - temperate climate)
Sweet potatoes would normally be harvested when the leaves of the vine start to turn yellow or when frosts begin. You can carefully remove them as soon as they are big enough if you want to but try not to damage the rest of the plant.
11 May 17, Jody Waaka (New Zealand - temperate climate)
Kia ora.Im thinking of starting a kumara garden soon.Where do you buy the seed from
13 May 17, Leslie Viljoen (New Zealand - temperate climate)
I'm not an expert but if you cut a Kumara into pieces, it will grow vines from the "eyes". We have one growing like crazy - but since it's cold now I think it's going to die.
15 May 17, Daniel (Australia - temperate climate)
With Kumeras, they will grow if you plant a whole kumara but they wont produce tubers. The shoots that do grow from that can be used as cuttings, and as these new cuttings grow, you will get the Kumera tubers growing from those new plants. Needs a long warm summer to grow bigger tubers! Hope that helps
07 May 17, Carol (Australia - temperate climate)
It is may and we have harvested some sweet potatoes - what I want to know is can I plant any of these smaller potatoes (as one would with seed potatoes) and let them grow through Winter? we have no frosts, or do I have to begine the plant again in Nov from a sprouting? I am just thinking it would seem good to take the smaller potato and plant in a new bed thro winder for an earlier crop?
07 May 17, Jonno (Australia - sub-tropical climate)
There is no reason why you couldn't save and plant the small tubers. They may not grow much in the cooler weather and you would need to ensure the soil is well drained so that they do not rot. Sweet potatoes are mostly grown from cuttings for ease and speed.
18 May 17, Mike (Australia - sub-tropical climate)
I live in Bundaberg (summer low 20's to low 30's C and winter low 10's to low 20's C - does get down to 4-6 a few nights)- now the sweet potato capital of Aussie. Sweet potatoes are planted all year round here. Quite often we see people in a sweet potato patch picking cuttings or runners to plant a new block of SP. I haven't seen the runners but I think if you plant it and keep it watered it will start making roots in a few days. Plenty of SP being planted now.
05 May 17, Don Latham (Australia - temperate climate)
HI, I'm near Kingaroy in Qld and my sweet potatoes have started to flower. I first grew them in a soil pile in the paddock, but didn't tend to them much and the kangaroos ate the leaves and vines as they were the only green plant around. I harvested some great tasting tubers and moved them to a proper garden bed closer to the house. I have also grown Kent pumpkins in the same bed with them, the pumpkins are almost finished. The sweet potatoes have grown long vine runners and now are starting to flower, they did not flower in their original soil pile. What does the flowering part mean? Is it like my sebago potatoes, nearing harvest time when they flower? This is only my second attempt to grow sweet potatoes and your input is greatly appreciated.
Showing 161 - 170 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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