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

11 Mar 20, Tineke (Australia - sub-tropical climate)
Brilliant! Mine are growing all over the place - better have a look see soon!!
10 Mar 20, ML (Australia - sub-tropical climate)
Many ways to grow things. You could have just a patch of swt potatoes and pick whenever you like. I'm growing them in my volunteer gardens. Take a slip of vine (about 40cm long), strip all the leaves off except the last 10cm of the growing tip, plant it along the ground with the tip out of the soil. Swt potatoes will grow from where the leaves were broken off. Or if you like put the slips in a bucket of water to have the slip producing roots before you plant it.
13 Jan 20, Paul (South Africa - Dry summer sub-tropical climate)
I m interested in Sweet potato farming where can i get the seedlings or cuttings in the Western cape or eastern cape (NOTE - Gardenate is not intended for farmers )
16 Jun 23, Dieter (South Africa - Summer rainfall climate)
You can get sweet potato slips from Living seeds.
15 Jan 20, Another gardener (South Africa - Summer rainfall climate)
You would have to look around your local area and find some sweet potato growers. I assume you are just wanting to plant a few. If a lot then ring your agricultural department. You need the new fresh part of the vines, about 1/2 m long, take all the leaves off except the last 3-4 where the tip is growing. Make a furrow in the soil and place the slip along it and cover the vine but leave the last few leaves out of the ground. Lots of water for the first 10 days.
05 Jan 20, MICHAEL PETERSON (Australia - tropical climate)
I planted sweet potato a couple of months ago and vines have started growing and no tubes, should I pull them all out and start again or is there something I can do to save them .
06 Jan 20, anon (Australia - tropical climate)
They say about 15-17 weeks to grow. You should have some tubers developing after about 10-12 weeks. Mine are about 10 weeks old and I dug out one about 5 (?)
24 Oct 19, anon (Australia - sub-tropical climate)
I talked to a commercial grower yesterday. Fertilise the ground before you plant. What fertiliser you use depends on how fertile your soil is. You would need a soil test to really find that out. But fertiliser with a reasonable amount of N, good P and high K. Mix this through the soil profile. If you cut off slips, make them about .4m long, strip off most of the leaves but leave the growing head part. Dig a furrow 50-75mm deep and place the slip in the furrow (place the slip level in the soil). Cover the slip over with soil but leave the growing bit sticking out of the soil. You could put the slips in a jar of water for a week or so to start the roots growing. Once you have planted the slip make sure it is watered for the next week, lIke each day. The soil around the slip has to be wet for the roots to shoot and grow. After a week or so you should notice the plant growing. The slip will produce sweet potatoes from where you stripped the leaves off giving a higher yield of crop. If the vines grow really long then I believe too high N, but I was told they need plenty of N. I was mainly asking about the placement of the slip but will ask more about the fertiliser next time.
26 Jul 19, Laurie Whelan (Australia - sub-tropical climate)
What fertilizer should you use prior to planting?
29 Jul 19, (Australia - sub-tropical climate)
Go on the internet and find out what N P and K do for plants. Then think about what you are growing with sweet potatoes.
Showing 71 - 80 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

Please provide your email address if you are hoping for a reply


All comments are reviewed before displaying on the site, so your posting will not appear immediately

Gardenate App

Put Gardenate in your pocket. Get our app for iPhone, iPad or Android to add your own plants and record your plantings and harvests

Planting Reminders

Join 60,000+ gardeners who already use Gardenate and subscribe to the free Gardenate planting reminders email newsletter.


Home | Vegetables and herbs to plant | Climate zones | About Gardenate | Contact us | Privacy Policy

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.
We cannot help if you are overrun by giant slugs.