Michigan Fresh: Using, Storing, and Preserving Sweet Potatoes (HNI26) (2024)

Michigan Fresh: Using, Storing, and Preserving Sweet Potatoes (HNI26) (1)

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July 24, 2023 - Christine Venema<venema@msu.edu>, Michigan State University Extension

Michigan Fresh: Using, Storing, and Preserving Sweet Potatoes (HNI26) (2)

Sweet potatoes require a long, frost-free growing season and, therefore, are best suited for southern gardens.

Food Safety and Storage

  • Purchase sweet potatoes that are firm, plump, blemish- free produce.
  • Choose sweet potatoes with a bright, uniform color, and be sure there is no sign of decay.
  • Raw sweet potatoes should not be refrigerated. Store in a cool (55–60 degrees F), dry, dark place, unwrapped, for up to two months or at room temperature for up to a week.
  • Wash hands before and after handling fresh produce.
  • Wash sweet potatoes well under cool running water using a vegetable brush. Do not use soap.
  • Keep sweet potatoes away from raw meat and juices to prevent cross-contamination.
  • For best quality and nutritional value, do not preserve more than your family can consume in 12 months.

Yield

2-3 pounds =

1 quart

How to Preserve

Canning

Pressure canning is the only safe method of canning sweet potatoes. Sweet potatoes must be pressure canned to avoid the potential of the foodborne illness botulism.

Choose small to medium potatoes. They should be mature but not fibrous. Wash and boil until partially soft, 15–20 minutes. Cool slightly and peel away skins. Cut into uniform pieces, either sliced or quartered, but do not mash or puree. Pack into hot jars. Leave 1 inch of headspace. Fill to within 1 inch of the top with boiling water or boiling sugar syrup. Remove air bubbles; adjust headspace if needed. Wipe jar rims with clean paper towel, adjust the lids and process (see tables that follow for recommended processing times).

Recommended process time (in minutes) for sweet potatoes in a dial-gauge pressure canner.

Canner pressure (PSI) at altitudes of

Style of pack

Jar size

Process time

0 - 2,000 ft

2,001 - 4,000 ft

4,001 - 6,000 ft

6,001 - 8,000 ft

Hot

Pints

65

11 lb.

12 lb.

13 lb.

14 lb.

Quarts

90

11 lb.

12 lb.

13 lb.

14 lb.

Recommended process time (in minutes) for sweet potatoes in a weighted-gauge pressure canner.

Canner pressure (PSI) at altitudes of

Style of

pack

Jar size

Process time

0 - 1,000 ft

Above 1,000 ft

Hot

Pints

65

10 lb.

15 lb.

Quarts

90

10 lb.

15 lb.

Let jars stand undisturbed for 12 to 24 hours, check lids to be sure they’ve sealed, remove rings, wash jars, date, label and store. Food in jars that do not seal must be reprocessed in a clean jar with a new lid within 24 hours, refrigerated or frozen.

Tables were adapted from from the National Center for Home Food Preservation (NCHFP), Selecting, Preparing and Canning Vegetables: Potatoes, Sweet– Pieces or Whole¸ reviewed February 2018 (https://nchfp.uga.edu/how/can_04/potato_sweet.html). The NCHFP adapted them from the Complete Guide to Home Canning (Agriculture Information Bulletin, No. 539). USDA, 2015.

Freezing

Allow sweet potatoes to cure for at least a week. This improves the flavor and allows the conversion of starch to sugar in the sweet potato. Cure sweet potatoes by keeping them at 80 to 85 degrees F and a humidity of 85 to 90 percent. After curing, wash well using a vegetable brush and cool running water. Cook before freezing; wrap in freezer wrap, place in freezer bags or vacuum package. If sweet potatoes are sliced or pureed, leave ½ inch of headspace. Seal, label, date and freeze. Use frozen sweet potatoes within a year of freezing.

References

  • Andress, E., & Harrison, J. A. (2014). So easy to preserve (Bulletin 989). (6th ed.). University of Georgia Cooperative Extension.
  • Jauron, R.(2002). Harvesting and storing vegetables. Iowa State University Extension.

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Michigan Fresh: Using, Storing, and Preserving Sweet Potatoes (HNI26) (2024)

FAQs

Michigan Fresh: Using, Storing, and Preserving Sweet Potatoes (HNI26)? ›

Food Safety and Storage

What is the best way to store fresh sweet potatoes? ›

Like other root vegetables and tubers, sweet potatoes are best stored in a cool, dry, dark place.

How do you keep sweet potatoes fresh after harvesting? ›

Store sweet potatoes in a warm building where the air is dry and the temperature uniform. The curing room may also be the storage room if conditions are right. Temperature during storage should be kept as close to 55 degrees F.

What is the traditional method of storing sweet potatoes? ›

In clamp storage, another simple and low-cost method, sweet potato tubers are stored in covered piles. The tubers in the best condition are selected, stacked in a heap on a layer of grass, and covered in layers of grass and soil. As with pit storage, ash, lime, and sawdust can be used for added effect.

How do farmers store sweet potatoes? ›

Sweet potatoes can maintain excellent quality for up to a year in proper storage conditions. The ideal storage conditions for sweet potato are the same as for winter squash; moderately warm (55-60F) at 60-75% relative humidity. - excerpted from the New England Vegetable Management Guide, nevegetable.org.

Do you wash sweet potatoes before storing? ›

If you are storing raw sweet potatoes, make sure you do not rinse them first. Rinsing could lead to rotting due to the extra moisture that is being introduced. Use a dry cloth to remove any dirt before you begin to store sweet potatoes. Another way to store raw sweet potatoes is to cure them for 1 to 2 weeks.

Can I freeze raw sweet potatoes? ›

Can You Freeze Sweet Potatoes? The simple answer is yes! Sweet potatoes can be frozen raw, baked, boiled, or even mashed. However, keep in mind that raw frozen sweet potatoes are likely to get freezer burn, so try to cook them in some way first.

How do you store sweet potatoes for the winter? ›

If you have a basem*nt furnace, that is the ideal place to cure your garden sweet potatoes. After the 30 day curing process, store your sweet potatoes in a dry area that will remain below 60 (15 Celsius) degrees but above freezing. Check your sweet potatoes weekly and remove any that begin to rot.

Can I cure sweet potatoes in the garage? ›

An ideal temperature range for curing sweet potatoes is between 80 to 85˚F with a relative humidity of 90 to 95%. Consider curing in a shed, garage, or a shady screened-in porch. In addition to shade, temperature, and humidity, airflow is another key factor in a successful curing process.

Which method is best for preserving sweet potatoes? ›

Raw sweet potatoes should not be refrigerated. Store in a cool, dry, dark place, unwrapped, for up to two months or at room temperature for up to a week. Cooked sweet potatoes can be stored in the refrigerator, frozen, dried or canned.

How to store sweet potatoes without root cellar? ›

These Veggies Like It Cool and Dry

They will last longest at 50 to 60°F and 60 to 70 percent humidity. (Again, storage times are for ideal conditions.) A vinyl-coated wire laundry cart tucked into a dark basem*nt room provides perfect storage for sweet potatoes.

When not to eat sweet potatoes? ›

How to tell if sweet potatoes have gone bad. If your sweet potato is soft in spots, smells rotten, or oozes a mysterious liquid, that potato should be discarded. Another sign that sweet potatoes have taken a turn for the worse is if they start growing stalky purplish sprouts.

How to store raw sweet potatoes long term? ›

It's best to keep sweet potatoes in a cool, dry area that gets good ventilation, according to the U.S. Sweet Potato Council. You really shouldn't store sweet potatoes in the fridge if you plan to eat them within a month or so, as refrigeration can bring on an unpleasant taste and a hard center.

How do you preserve sweet potatoes after harvesting? ›

To cure roots, hold them at 85 degrees F with 90 to 95 percent relative humidity (RH) for 4 to 7 days. After curing, reduce the storage temperature to 55 to 60 degrees F at 80 to 85 percent RH. Most properly cured sweet potato cultivars will keep for 4 to 7 months.

How long will sweet potatoes last in a root cellar? ›

Stored on the counter, raw sweet potatoes generally last up to two weeks. When stored in a cool, dark, dry area (similar to a root cellar), sweet potatoes can last about a month. Maximize their shelf life by storing them at a cool temperature.

How long do raw cut sweet potatoes last in the fridge? ›

Should I Refrigerate Raw Sweet Potatoes? Whole, raw sweet potatoes should not be refrigerated, as it can affect their taste and make them hard in the center. Do refrigerate after they've been cut, though. Covered in cold water, they last about a day.

What is the best way to store potatoes at home? ›

Store your potatoes in a cool, dark place (45 to 50 F is the ideal temperature range), such as your pantry or unheated basem*nt. 2 Do not store them on top of your refrigerator or next to your stove, as both spots emit heat.

Can you cut a sweet potato in half and save it? ›

Yes, you can cut that sweet potato in half and save the rest for later! You can absolutely cut a large sweet potato in half–the unused half will heal itself right before your eyes. Sweet potatoes, a member of the morning glory family of vines, are a warm-weather root crop that grow underground like white potatoes.

Can you cut and store sweet potatoes ahead of time? ›

You can peel and cut sweet potatoes and store them in the fridge for up to 24 hours in advance for easier meal prep, according to the Chef John Folse Culinary Institute at Nicholls State University. To do this, place the raw, cut sweet potatoes in a bowl of water — covered — in the fridge to keep them fresh.

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