Learn when and how to harvest potatoes

When to harvest potatoes in garden beds and containers

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Potatoes are one of the easiest crops to grow producing a bounty of tasty tubers when planted in garden beds and containers. Plus, there’s so many awesome potato varieties to grow – from fingerlings to russets – in a rainbow of colors. But as the crop is produced below ground, it’s hard to tell when the tubers are ready to dig. So, how DO you know when to harvest potatoes? 

Learn how to harvest and store homegrown potatoes.

Don’t wash potatoes after harvesting unless you’re about to eat them. Instead, cure them for one to two weeks and then store in a cool, dark place.

When to harvest potatoes? 

Harvesting potatoes is so much fun, even the kids will want to help. It’s like digging for buried treasure – treasure you can eat! There are two main types of potatoes: new potatoes and storage potatoes, and both harvesting time and techniques differ between the two types. Because I want both new potatoes for summer cooking and storage potatoes for fall and winter, I plant at least one bed of each. Figuring out when to harvest potatoes can be a challenge for new gardeners, but once you know the basics, timing the harvest is a snap!

New Potatoes – All potatoes can be new potatoes if harvested when the tubers are still small and thin-skinned, about 50 to 55 days from planting for early maturing varieties. The first sign that new potatoes have formed is the appearance of the flowers. At that point, feel free to start harvesting.

Storage Potatoes – Storage potatoes, also called main-crop potatoes, are ready at the end of the growing season when the foliage has turned yellow and begun to dry. Some gardeners cut off the foliage while others allow it to die back naturally. Either way, the tubers need to be left in the ground for about two more weeks. This allows the skins to thicken up, which results in better storage quality. 

New potatoes can be harvested after potato plants flower

Don’t be shy about trying some of the awesome varieties of potatoes available through catalogs and in garden centres. Caribe is a gorgeous purple skinned variety with bright white flesh. it’s not a long storage type, but makes a wonderful new potato.

How to harvest potatoes

Pick a dry day to harvest potatoes as moisture can spread disease and rot. What’s the best way to harvest? Carefully! Try to avoid piercing or slicing the potatoes when digging the tubers. If your spade does slip, eat damaged potatoes right away. I find it handy to keep a bowl nearby for damaged tubers which then head directly to the kitchen.

New Potatoes – When the plants begin to flower you can start harvesting new potatoes by reaching into the side of the hill and taking a few tubers from each plant. I use a gloved hand, not a tool, for this task as I don’t want to damage the plants and I want to keep my hands (relatively) clean. Once you’ve harvested a few new potatoes, push the soil back in place and mound it around the plants. 

If harvesting new potatoes from a container or potato grow bag, reach into the soil to feel around for the tubers, taking just a few from each plant at any one time. After harvesting new potatoes from in-ground or container plants, feed them with a fish emulsion fertilizer to encourage healthy growth and more tubers.

Storage Potatoes – To harvest storage potatoes, insert a garden fork about a foot away from the plant and gently lift the root mass. There may still be a few potatoes in the ground, so use a gloved hand to feel around for any missed tubers. Once harvested, gently brush off caked on soil and allow them to dry off for an hour or so outdoors. Do not wash the tubers. 

Container grown storage potatoes can be easily harvested by dumping the container onto a tarp or in a wheelbarrow. Sift through the soil with your hands to grab all of the tubers. 

Potatoes are easy to grow and fun for kids to harvest.

Kids love to help dig potatoes in the garden – and they may even eat their veggies!

How to store potatoes

Before they can be stored, potatoes need to go through a curing process. This helps the skin thicken up and extends the storage life of the tubers. To cure potatoes, lay them on newspaper, trays, or cardboard in a cool, dark spot (50 to 60 F, 10 to 15 C) with high humidity for one to two weeks. Pick a location that offers good air circulation. 

Once cured, move the potatoes (removing any that have signs of damage) to bushel baskets, cardboard boxes (with ventilation holes poked in the sides), low baskets, or brown paper bags. You can also find multiple drawer harvest storage at many garden supply stores. Don’t pile them too deeply, however as that can encourage rot to spread. Cover containers with cardboard or sheets of newspaper to block light. 

The storage area should be cooler than the curing site and be dark and well-ventilated. I use a corner of my basement, but a root cellar is best if you have one. Aim for a temperature of 40 to 45 F (4.5 to 7 C) with high humidity. Under ideal conditions, storage potatoes can retain quality for six to eight months. Check tubers regularly and remove any that show signs of rot or shrivelling. 

The thin skin that makes new potatoes so appealing limits their storage life to weeks not months. Therefore, enjoy new potatoes soon after harvesting them.

For a tutorial on when to harvest potatoes and how to do it right, check out this video by Savvy’s Jessica Walliser.

Do you have any tips to add on when to harvest potatoes? Leave them in the comments below. 

For more on growing potatoes in a garden, check out these awesome articles:

Learn when and how to harvest potatoes.

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5 Responses to When to harvest potatoes in garden beds and containers

  1. Doug says:

    Thanks so much!! I’m a new gardner and using bags to plant beets and potatoes. I didn’t have a clue about what I was doing but a good crop of potatoes came up in the bag. The flowers have just died leaving seed pods in their place. I learned that the seeds can be used to start new potato projects. The best part is that your description of how to check when to harvest the potatoes is both timely (for me) and useful. Many thanks again.

  2. Julie Friedman says:

    I am new to growing potatoes and just harvested a couple dozen. Too many to eat at once. How long can I keep these? Can I cure these? And if so, what is the process?

    I read about also leaving potatoes in the ground until October and then letting them sit on the soil to cure for a couple hours before storing. I will do that with the remaining plants.

  3. Anne says:

    Thank you for such an informative article. I’ve just planted my first potatoes and am waiting now to harvest them. Can’t wait to grow new ones using the information you’ve provided. Thanks again!

  4. Tanya Covey says:

    Hi! I have grown potatoes twice before and haven’t run into this problem. This year I noticed my plants beginning to wilt. While waiting a few days to harvest, we received a bunch of rain. The day after the rain, I went out to check on things and noticed I have several newly sprouted plants! What should I do? HELP!

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