How to Stop Stored Potatoes Going Soft

Stored potatoes go soft when they lose moisture, start to rot, or are kept in poor conditions. Soft potatoes don’t store well, cook badly, and often signal deeper storage problems. With the right preparation and storage setup, you can keep potatoes firm and usable for months.

⭐ Recommended Products — Seed Potatoes & Planting Essentials

• Seed Potato Collection (Early, First & Second Earlies)
A mixed pack of quality seed potatoes to plant for a steady harvest from early summer through to autumn. Ideal if you want variety in size and maturity times.
👉 Click here to see top options

• Certified Seed Potatoes (Single Variety Packs)
Choose popular individual varieties (e.g., Maris Piper, Charlotte, King Edward) to suit your taste and growing goals — consistent results from true seed stock.
👉 Click here to see top options

• Potato Grow Bags / Containers
Reusable, breathable bags designed specifically for growing potatoes — great for patios, small gardens, or increasing yield in limited space.
👉 Click here to see top options

• Potato Fertiliser / Soil Booster
Specially formulated feed to support healthy tuber development and improve yields — apply at planting or as a top-dress during the season.
👉 Click here to see top options

• 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.
👉 Click here to see top options

Why Stored Potatoes Go Soft

Potatoes soften due to:

• Moisture loss and dehydration
• Warm storage temperatures
• Poor airflow
• Rot or disease spreading
• Storing damaged or immature potatoes

Softness usually develops gradually and worsens if conditions aren’t corrected.

Store Potatoes at the Correct Temperature

Temperature plays a huge role in firmness.

Ideal range: 4–8°C

• Too warm → faster moisture loss and sprouting
• Too cold → texture damage and poor flavour

Choose a consistently cool, frost-free place such as a garage, cellar, or cool cupboard.

Keep Potatoes Out of the Light

Light causes potatoes to green and speeds up deterioration.

• Store in complete darkness
• Cover containers fully
• Avoid bright cupboards or windows

Darkness helps slow ageing and moisture loss.

Use Breathable Storage Containers

Potatoes need airflow to stay firm.

Best containers include:

• Hessian or jute sacks
• Paper sacks
• Slatted wooden crates
• Cardboard boxes with air holes

Avoid plastic bags or sealed containers, which trap moisture and encourage rot.

Store Only Dry, Healthy Potatoes

Before storage:

• Dry potatoes thoroughly
• Do not wash them
• Remove damaged, cut, or diseased tubers

Wet or damaged potatoes soften and rot quickly, affecting nearby potatoes.

Cure Maincrop Potatoes Before Storage

Curing toughens skins and seals minor wounds.

• Cure for 10–14 days
• Store in darkness at 12–18°C
• Maintain good ventilation

Cured potatoes retain moisture better and stay firm longer.

Keep Potatoes Dry but Not Dehydrated

Excess moisture causes rot, while very dry conditions cause shrivelling.

• Store in breathable containers
• Avoid direct airflow from heaters or vents
• Raise containers off cold or damp floors

Balanced conditions prevent softness.

Separate Potatoes from Onions

Onions release gases that speed up deterioration and softening.

Always store potatoes and onions in separate locations.

Check Stored Potatoes Regularly

Inspect potatoes every 1–2 weeks:

• Remove any soft or rotting potatoes
• Check for condensation or dampness
• Adjust storage conditions if needed

One soft potato can quickly spoil the rest.

When Soft Potatoes Are Still Safe

Potatoes with:

• Slight softness
• Small sprouts
• No smell or rot

can still be used if peeled and cooked immediately. Discard potatoes that are mushy, mouldy, leaking, or foul-smelling.

Final Thoughts

Stopping stored potatoes from going soft is all about moisture control, cool temperatures, and good airflow. By storing only healthy potatoes in dark, breathable, and stable conditions, you can keep them firm and usable for much longer.

Good storage habits protect your harvest and reduce waste.