How to Cure Potatoes After Harvest

Curing potatoes after harvest is a vital step that toughens the skins, heals small cuts, and dramatically improves storage life. Proper curing helps prevent rot, reduces moisture loss, and keeps your potatoes firm and usable for months.

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Specially formulated feed to support healthy tuber development and improve yields — apply at planting or as a top-dress during the season.
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• Potato Planting Guides & Markers
Helpful tools and guides that take you through planting depth, spacing, and care — plus reusable markers to keep track of different varieties.
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Why Curing Potatoes Matters

Freshly harvested potatoes have delicate skins that bruise easily and allow disease to enter. Curing allows the skin to thicken and minor wounds to seal, making potatoes far more durable for storage and handling.

When to Cure Potatoes

Potatoes should be cured immediately after harvesting, especially maincrop varieties intended for long-term storage. Early potatoes are usually eaten fresh and do not require curing.

Harvest on a dry day if possible, and avoid washing potatoes before curing.

How to Cure Potatoes Properly

1. Dry Off Excess Soil

Gently brush off loose soil by hand. Do not wash the potatoes, as moisture encourages rot during curing.

2. Choose the Right Conditions

Cure potatoes in a dark, well-ventilated place with:

• Temperature: 12–18°C
• Humidity: 85–95%
• No direct sunlight

Garages, sheds, spare rooms, or dark cupboards with airflow work well.

3. Spread Potatoes Out

Lay potatoes in a single layer in shallow trays, boxes, or on newspaper. Avoid piling them too deeply, as poor airflow can cause rot.

4. Leave to Cure

Allow potatoes to cure for 10–14 days. During this time:

• Skins will harden
• Small cuts will heal
• Tubers become more storage-ready

Check regularly and remove any potatoes showing signs of rot.

What Not to Do When Curing Potatoes

• Do not wash potatoes before curing
• Do not expose them to sunlight
• Do not cure in cold or damp conditions
• Do not seal them in airtight containers

Mistakes during curing often lead to greening, mould, or premature spoilage.

After Curing: Preparing for Storage

Once cured:

• Gently brush off remaining soil
• Discard damaged or soft potatoes
• Store only healthy, firm tubers

Move potatoes to a cool, dark, frost-free place for long-term storage.

Best Storage Conditions After Curing

• Temperature: 4–8°C
• Darkness to prevent greening
• Good airflow
• Stored in breathable bags, boxes, or paper sacks

Avoid storing near onions, as they release gases that speed up spoilage.

How Long Cured Potatoes Last

When cured and stored correctly:

• Maincrop potatoes can last 4–6 months
• Some varieties may last even longer

Regularly check stored potatoes and remove any that begin to spoil.

Final Thoughts

Curing potatoes is a simple but essential step that transforms freshly dug tubers into long-lasting, high-quality crops. By taking the time to cure them properly, you’ll reduce waste, improve flavour, and enjoy your homegrown potatoes well into winter.