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

08 Oct 18, Mike (New Zealand - sub-tropical climate)
Also you can use 50-60cm sections of the growing plants 6-8 week old and plant them along the ground with the tip out of the soil. Roots will grow from where each leaf joins the vine.
01 Oct 18, Jeanette (Australia - sub-tropical climate)
I'm in Ipswich Qld .I've planted a whole tubor of the purple sweet potato ( after it produced roots in water) and it's shooting up beautifully, do I break these off and plant separately? or try to grow roots in water first? I have had no luck at all with the orange sweet potato.
02 Oct 18, Mike (Australia - sub-tropical climate)
Cut it into 4-6 pieces and plant. Then when they have grown for about 2 mths take some of the vine about 5-600mm long and plant in the soil laying horizontal with just the end sticking out of the soil. Water well for week or so.
19 Sep 18, Eddy (New Zealand - temperate climate)
Can they grow on canterbury christchurch
06 Oct 18, denise (New Zealand - temperate climate)
i live in Kaiapoi and grow in tubs. the soil is warmer
21 Sep 18, Mike (New Zealand - temperate climate)
Did you read the notes here. I suggest you do and pay attention to when to plant.
16 Aug 18, Adrienne (New Zealand - sub-tropical climate)
Can you please tell me what is the best type of fertiliser to prepare the soil for kumara?
11 Sep 18, Mike (New Zealand - temperate climate)
Any general fertiliser - but probably something with a fair bit of P in it. N P K - something like 10 -14N, 6-10 P, 10-15 K.
10 Jul 18, Cathy (Australia - temperate climate)
When my tomato bed finished i refilled the bed with conpost and the sweet potatos started growing. I got quite a few potatoes and pulled them out in September to replant tomatoes. I couldnt get tomatoes to grow that summer so i gave up and let the je sweet potatoes come back naturally. Should i try for tomatoes again in that same bed? If so do i need to help the soil in any way? Thanks!!
13 Jul 18, Mike L (Australia - temperate climate)
I have been told sweet potatoes are a big consumer of nutrients from the soil - other words not much nutrient left in the soil after the crop Tomatoes would also take a lot from the soil. Did you add compost or totally refilled the bed with compost again. If the compost is not totally broken down then it will take N from the soil - therefore very little N for the intended crop. Look to the guide here for planting - although it has no planting time for sweet potatoes in temperate climates. After each crop you need to do one of two things - add completed compost, manures etc and make sure this is all broken down into the soil. Or you hit it up with some all round fertiliser. Also give your soil a rest for a few months and add compost and turn it in.
Showing 111 - 120 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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