Growing sweet potatoes is simple and fun to do in your own vegetable garden. Learn how to grow sweet potatoes from slips, plus how to care for them and when to harvest sweet potatoes!
Sweet Potatoes are a sweet tasting, tuberous root vegetable that is packed full of nutrition. They contain high levels of Beta-Carotene, Vitamin A and Vitamin C as well as many more.
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Sweet Potatoes are not potatoes, they actually belong to the Convolvulaceae- or Morning Glory- Family. They are pretty simple to grow yourself and you’d be hard pressed to find a better yield- both in nutrition and produce- for the amount of time and space it takes to grow sweet potatoes.
How to Grow Sweet Potatoes:
As I said, sweet potatoes are not the same as the regular potatoes of the Nightshade family, so their growing and planting needs are totally different. Sweet Potatoes are grown from slips, which can be purchased from a local seed or farm store. Slips look like long leafy stems with roots.
If you don’t want to purchase your slips you can start them at home from a purchased organic sweet potato (Here is a nice tutorial on starting slips). There are a couple of different ways to start slips, but the basic idea is to suspend or place the sweet potato in water until it begins to sprout and root.
This will take about 6 weeks, so make sure you give yourself plenty of time for the the slips to grow. Once they are about 6 inches long, preferably with roots, you pinch the slips off of the sweet potato and plant them.
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Site and Soil Preparation for Growing Sweet Potatoes:
Sweet potatoes are very easy to grow and don’t have a lot of requirements, but they do prefer a warm, sunny location, so make sure you plant them where they will get full sun. They also do not tolerate cold well, so plant them well after the threat of frost has passed and the soil has warmed.
Sweet Potatoes need a long growing season, with the normal planting time being in May and Harvest in October, just before first frost. They do well in most areas, and need little in the way of soil amendments.
Sweet Potatoes need a light, sandy soil with good drainage for proper tuber formation, so if your soil contains a lot of heavy clay be sure to amend it to make it more of a sandy loam- or grow them in containers.
In terms of fertilizer, sweet potato plants do need a healthy, fertile soil but unlike most plants they don’t require a lot of Nitrogen. Too much nitrogen will actually cause the leafy top growth to grow very well, but with very little development of the tubers you want! So save your chicken manure for the tomato bed!
Planting Your Sweet Potato Slips:
Sweet potato slips are usually long stems- at least 10-12 inches long. When we buy them they come in a bunch of 50, and must be kept constantly moist. So if you don’t plant them right away keep them in a bucket of water so they don’t dry out. When you are ready to plant, you want to plant them about 12-18 inches apart in holes at least 6 inches deep.
Some people plant them in rows, but I tend to make just one big bed with the sweet potato plants evenly spaced throughout. I don’t have a need to walk through the bed once the vines take over and I take an early harvest from the edges. When planting the slips, plant them deep- burying them up to the top leaves if possible.
Any part of the stem that is underground will grow roots and give the plant a stronger start. Water is very important during the beginning stages of growth so make sure to water well at planting time, and while their roots are getting set.
If you don’t own your own land, have a small yard or don’t have the space to devote to growing sweet potatoes in the ground, you can grow sweet potatoes in containers. They need space to grow the tubers- but any large container will do for a planter. I have seen people use 5-gallon buckets, bushel baskets, and even large growing bags.
Simply fill the container with a good, light soil and plant your slip up to the top leaves. I would only do one slip per container, so that they don’t get too crowded. The vines will grow everywhere, but you can add a trellis to the container or just let the vines spill over the edge onto the ground around them.
Sweet potatoes are in the same family as morning glories and have similar flowers.
Caring for Your Growing Sweet Potato Plants:
It’s a good idea to mulch your sweet potato bed, especially in the beginning. The vines will spread , but they can be slow to start, so be sure to keep the bed as weed free as you can until the vines take over.
We use black plastic mulch, since it helps to warm the soil and prevent weeds. Growing on plastic mulch will also prevent the sweet potato vines from rooting. If you choose a different mulch, or none at all, be sure to lift the vines occasionally to pull up any vines that may have rooted so that they will put more energy into the main crop instead of lots of little ones.
I mentioned before that water is very important in the early stages of growing sweet potatoes. They can be very sensitive to drought so if you don’t get rain, they need to be watered at least once a week for the first few weeks. After about a month, the vines should be strong enough to take care of themselves in terms of weeds and water, but if you are in a drought, they will benefit from a weekly deep watering.
Once it gets closer to harvest time, the opposite is true- too much water can cause the tubers to rot, so don’t water at all during the last few weeks before harvest and just let Mother Nature call the shots.
The vines are very vigorous, so be prepared for them to go everywhere! I think they are quite pretty, and in the fall they will start to bloom with flowers that are similar to their cousins the Morning Glory. If you are short on space you can grow them up a nearby fence or trellis.
Resist the urge to cut the vines if they get outside their assigned plot- the vines are feeding the plant! You can, however, try and turn them so that they continue to grow back towards their garden bed.
I consider sweet potatoes to be a “plant it and forget it” type of plant. I plant it in May, water nightly for a couple of days and then just leave them until fall when I harvest. They are a very easy, low-work, plant to grow.
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How and When to Harvest Sweet Potatoes
Sweet Potatoes can be harvested as soon as they are a suitable size, usually in late summer or early fall, but their flavor and quality will improve with exposure to cooler temperatures.
The longer you leave them in the ground the higher your yield and vitamin content will be. I usually start pulling from one or 2 plants in early fall, but save the bulk of the harvest for later.
Once the weather has turned cooler and you get close to your first frost date you can begin to harvest your sweet potatoes. It is best to harvest all at once, on a warm sunny day.
Since you want them to sit in the sun for a bit after they are dug up, it is also best to dig them when the soil is dry. The majority of the tubers will be directly under the plant, but they can be up to 12 inches away as well.
Most people use a spade fork to harvest, but a shovel will do just fine. Start at the outer edge and dig carefully so you don’t damage any of the tubers, as they can be bruised easily.
Allow the newly dug sweet potatoes to dry in the sun for at least a couple of hours before bringing them in to cure. The plants are very sensitive to frost. You can leave them in the ground until the first frost, but be prepared to get all of them out of the ground immediately if you do it that way.
How to Cure Sweet Potatoes:
Curing is an important step to ensure that your sweet potatoes will last as long as possible, as well as improving the flavor and texture of the tubers. You can cook them straight from the ground- I do all the time- but their natural sweetness increases with curing. Curing will also help to toughen the skin and heal any nicks, cuts or damage received during harvest which will make them less likely to rot during storage.
To cure sweet potatoes you want to lay them out in a well ventilated room with a temperature of about 85*F and a high humidity. We usually lay them out on newspaper in front of the fireplace/wood stove. Keep them curing at this temperature for about 10-14 days, then move them to storage.
Proper storage temperature is also important in order to keep the sweet potatoes in top quality. Optimum storage is dark with a temperature of 55-60*F. If you cure and store your tubers at the optimum temperatures they should last at least a few months.
Exposure to colder temperatures tend to cause the centers to harden and higher temperatures make the tubers dry and stringy or them may begin to sprout. We store ours in one of our lower kitchen cabinets- it’s dark and the farthest room from our wood-stove, so it’s usually pretty cool.
Optimum temperatures are hard to recreate in a home environment, but if you can get close to them you should be able to keep your sweet potatoes in a good, eating quality through out the winter.
Sweet Potatoes are still edible as long as they are not soft, wet, showing signs of rot or sprouting. If they are exposed to cold temperatures- such as from being stored in the refrigerator, they will be hard, tough and virtually inedible. If you don’t have a good place to store your sweet potatoes you can always cook them and freeze them, or try and can them using a pressure canner.
Using Your Sweet Potato Harvest
Sweet potatoes are very versatile. You can bake them and eat them plain or puree them and use them in baked goods. Some of my family’s favorites are:
- Oven-baked, seasoned sweet potato fries
- Sweet potato biscuits
- Sweet potato muffins
- Sweet potato pie
- Sweet potato yeast rolls
We also enjoy them sauteed with other garden vegetables or just plain with butter.
Related Reading: 50+ Sweet Potato Recipes for Your Fall Harvest
Have you tried growing your own sweet potatoes? Do you have a favorite recipe that uses them?
Check out my other growing guides as well! Including The 11 Easiest Vegetables for Beginning Gardeners.
Now I am really excited about growing sweet potatoes next year! Thank you for the detailed information. I really enjoyed learning so much about growing my own sweet potatoes!
These are great tips! I had no idea that sweet potatoes bloomed…how pretty!
Pinning :)
~Lorelai
Life With Lorelai
Wow, what good info! I am not yet ready to add potatoes to my garden, but when I do sweet potatoes will be there. My son LOVES them. I will come back and see here how to do it! Thank you!
You will not believe it, but I do grow a sweet potato too. It happened accidentally, one of my potatoes just put out leafs while siting in a drawer waiting to be eaten. Well since that happened, I planted it in a pot in a greenhouse, so I could take it in if needed. I do not expect a real harvest, but it sure is a fun experience.
Oh it should be leaves, sorry, English is not getting easier :(.
English is difficult, even for us native speakers. :) Have fun with your sweet potato plant!
This is great! My mom is harvesting sweet potatoes now, too!
This is something I we would use a lot – we love sweet potatoes! Thanks for the great post :)
I love this post. As a child, my family had a garden and I enjoyed harvesting and eating fresh food. At present i live in Las Vegas so gardening is a challenge. Thanks for reminding me of it. I was thinking of trying a small, well-tended garden in the spring and this adds to my bucket of motivation toward that end. :D
Heather @ Exalted Peacock
Thank you so much for posting this info on sweet potatoes. Will be trying this next year! :-)
We buy bushels of them on a regular basis and it would be wonderful to start growing our own.
Could you can them pureed? Any canning tips you could give us?
Sorry! I have never canned them. With my family of 7 we go through them pretty quickly. If they start to age I usually just puree and freeze what’s left.
Sweet potatoes must be cubed – not puréed – to be canned safely. The purée is too dense to reach a safe canning temperature in the middle of the jar.
Great informative post!
I grow sweet potatoes in an old bath and they do really well. The moisture stays in the soil longer, which is a bonus in our dry climate :)
I forgot about my sweet potatoes in the drawer and they now have sprouts about 6 inches. It is now October and I live in Ohio. I wonder can I start a garden in the house? I am going to plant them in a bucket and see what happens. Do you think this will work?
If you have a warm, sunny window it might work. I have never tried growing them indoors, but they don’t require pollination so it’s worth a try. Is the sweet potato from the garden, store, farmer’s market??
We have been trying to replace white potatoes with sweet potatoes when we can. Thanks for the info.
sweet potato
I started some sweet potatoes back in July in a barrel. They are growing straight up…about 5′ in height right now??? What happened and what do I do with them. When should I try to harvest them. I live in Central Texas, so we don’t have much of a winter. Fall is our best crop for almost everything.
They need about 5 months in the ground. If you aren’t in danger of frost you are fine to leave them as long as you wish. You should be able to feel the tubers under the soil, or even see them directly under the plant. Did you plant slips? Are you supporting them with anything?
I guess I planted slips. i cut it in strips and planted those. i am not supporting them with anything right now. They are standing straight up. Guess I will need to do that?? We usually don’t get a frost till January or February…if then.
If these plants came straight from the potato they will not produce. The plants must be transplanted to get a crop .
That’s not true. My husband and I just throw regular sweet potatoes from the grocery store that have started to sprout in the ground and get pounds and pounds of sweet potatoes.
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Hi, this is great. I live in MA and have failed twice with sweet potatoes. The problem is that the slips get delivered to me weeks before it’s warm enough to plant them. The directions say to keep them wrapped in a damp paper towel, but that has not been enough to keep them alive. From what you say, I think I will try keeping them in a cup of water. And I’ll ask the seed company to not ship them until late May.
I get mine from Southern Exposure online and they seem to ship everything at the right time. They also have a lot of cool, rare heirloom seeds and provide interesting historical tidbits about a lot of the plants.
If I have some sweet potatoes now to store for next season, how do make sure they don’t rot? And do I/ can i save what is growing out of them now?
I enjoyed reading all about sweet potatoes, I have been growing sweet potatoes for 3 years I learn something new everytime. I start my slips early March from sweet potatoes from last harvest, I put the slips in jars of water until planting time around June 15th, I do give the slips clean water ounce a week, I plant in rows 12 inches apart both ways, it gave me plenty of room to dig and not injure the potatoes, I then harvest keeping an eye on the weather right around the 90 days, end of September good results, I cure mine then store them. Easy to plant and the rewards are great. I call them my treasures when I dig them up.
I’m so confused. I’ve tried for many years to grow sweet potatoes. All I get is a beautiful bed of green leaves with flowers. They never produce. They always are the size of string beans. Fresh soil and compost with sand. Any ideas what I’m doing wrong?
Too rich with nitrogen, use low N, high P and K, that will help and make sure the get a lot of heat…
Thank you. This information is very helpful. I am trying to grow sweet potatoes and was wondering about when to harvest them. I can’t hardly wait to see what has been happening under ground. The vines are quite pretty and long. I planted in raised garden bed boxes.
I had vines all over my garden last year and some were trying to
root down now I know to turn vines and not let them root down was tempted to cut the vines so now I know not to do it thanks very much real helpful
I live in the southern part of Australia. This is the first time I have tried to grow Sweet Potatoes. We do have frosts in our area, however I have wrapped plastic around the plant and covered the trellis with a heavy material. It seems to be growing at the moment but I will wait until our spring summer around October to March to see if I was successful.
October 28, 2020
I just dug up my harvest of sweet potatoes. I decided to try it when a store bought sweet potato sprouted. Got my info online and probably from your post. I have it pinned. I was able to obtain “sweet licks” containers from one of my cattle ranching neighbors. They’re very large and worked great. I had only two so it wasn’t a huge harvest but I was pleased with what I got. I will need to start earlier this coming spring now that I have a better idea of what I’m doing. Thanks so much for the information. The deer seem to like the foliage so I will also need to protect the vines next year.
I live in a place that doesn’t get frost and is super dry and super hot. December is the coolest month at around 55 for a high temp.when would be a good time to plant sweet potatoes in a pot?
I tried sweet potatoes for the first time this year. I used two organic potatoes from the market, planted about 15 slips, I got only one flower on all the vines, and had chip monks eating the vines off just above the ground in early fall, When I harvested them in early Oct. I found some small, some larger, but had a finnish yield of 27 pounds of sweet potatoes. TOM Z.
There was an earlier comment about the potatoe itself will not produce, after cutting off all the slips I was going to use I stuck the potatoes in two different flower pots, because they make nice house plants. One potato per pot, and in the fall when I was making ready for winter and cutting back all my flowers, I was about to throw the potatoes away, I figured they would be rotting are gone, I found the potato still there and the whole pot filled with new ones.
my sweet potatoes have long vines, the vines have tiny roots ,can i cut some of these sections and use them fer new slips
I grew sweet potatoes last year. I got lots of beautiful vines and lots and lots of skinny roots. what happened
if you grow your sweet potatoes in a container should you replace the soil each year? if you grow in the ground should you wait four years before reusing the same spot for sweet potatoes like
many suggest for regular potatoes?
I’m trying to get this binder. I clicked on it, but nothing?