Growing Yam/Oca, also Oka

Oxalis tuberosa : Oxalidaceae / the wood sorrel family

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

(Best months for growing Yam/Oca in USA - Zone 5a regions)

  • P = Plant tubers
  • Plant tubers about 5cm (1.5") deep covered with soil. Best planted at soil temperatures between 63°F and 95°F. (Show °C/cm)
  • Space plants: 12 - 18 inches apart
  • Harvest in 15-20 weeks. Leave in the ground until foliage has completely died down so tubers reach maximum size.
  • Compatible with (can grow beside): Best in separate bed

Your comments and tips

28 Dec 15, Carole Snowdon (Australia - temperate climate)
Have been unable to find what I would call Kumara in Aus, as described by Chris Hanson, but a much smaller tuber than the sweet potatoes of all types we get here commercially. I suspect import restrictions may prevent them coming here, but did get some at a NZ Day celebration in Canberra some years ago. If you find some please let me know I miss them also. I have just received in the middle of summer, my yam tubers (Oca) but living in the Central Coast need to know if I can plant them in a container now in a mostly shady spot will that be okay. It gets pretty hot here in summer.
30 Dec 15, John (USA - Zone 9b climate)
If you have any relatives or friends in Tonga, Kumara were very common there when I was visiting some years ago.
11 Jul 15, Lyn Austen (Australia - temperate climate)
Hi Chris,I too am looking for the old fashioned knobbly skinny kumara tubers. Even in nz my family complain the taste has gone from the larger tubers which I assume has been developed for commercial use. I will keep looking and let you know when I find them,Lyn Austen
05 Apr 15, lionel (Australia - temperate climate)
where can i buy new zealand yams in australia?
03 Aug 13, nola matthews (Australia - temperate climate)
Try Diggers Club. hey sell them in bulb form & in pots at certain times of the year. Hope this helps
21 May 10, Paul (Australia - temperate climate)
I'd be interested in buying some Oca / Yam seed in WA. Does anyone know of any?
17 Jun 12, Disappointed (Australia - temperate climate)
My Father in Law threw my entire bumper crop out thinking that they were weeds.
17 Jan 10, leigh morris (Australia - temperate climate)
as an ex kiwi i really miss the purple kumara & the yellow/orange yams unfortunately the orange/golden/and purple flavoured sweet potatoes don't have the same flavour and i have not been able to find yams anywhere
09 Jan 10, john studte (Australia - temperate climate)
Hi John in Tassie again.I have quite a good crop growing at the moment and should be plenty to spare in aprox two monthsPlease contact email ad above.
02 Sep 10, Steve C (Australia - cool/mountain climate)
Hi John, I have been trying to get hold of some Oca tubers to plant this year and have not found a source in Tassie as yet-the closest i got was Young's veggie shed in Nthern Tas, sometimes they get them in from a local grower. Any chance that i can buy some off you? Cheers Steve
Showing 111 - 120 of 145 comments

Hello can you grow Oca in the tropics maybe during the cooler drieronths? No frost up here, just concerned about planting in the wet season as its ver hot 35 degrees plus most days.

- Hayley

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