Storing potatoes correctly is key to preventing them from turning green, which indicates the presence of solanine, a natural toxin. Proper storage involves keeping them in a cool, dark, and dry place with good ventilation. Avoid refrigerating them, as this can convert their starches to sugars, affecting taste and texture.
Why Do Potatoes Turn Green and How to Prevent It?
Potatoes turn green when exposed to light. This exposure triggers a process where the potato produces chlorophyll, the same pigment that makes plants green. While chlorophyll itself is harmless, its presence often signals an increase in solanine, a glycoalkaloid compound that can be bitter and, in large quantities, toxic.
The Science Behind Green Potatoes
When potatoes are exposed to light, they begin to photosynthesize. This process leads to the production of chlorophyll, which gives them their green hue. Simultaneously, the potato may also increase its production of solanine as a natural defense mechanism.
Optimal Storage Conditions for Potatoes
To avoid greening and maintain potato quality, focus on these key storage elements:
- Cool Temperatures: Aim for a temperature between 45°F and 55°F (7°C and 13°C). This is cooler than typical room temperature but warmer than a refrigerator.
- Darkness: Light is the primary culprit for greening. Store potatoes in a dark pantry, cellar, or cupboard.
- Dry Environment: Excess moisture can lead to sprouting and rot. Ensure the storage area is not damp.
- Good Ventilation: Potatoes need to breathe. Use breathable containers like paper bags, mesh bags, or baskets. Avoid plastic bags, which trap moisture.
Best Practices for Storing Potatoes Long-Term
Storing potatoes effectively ensures they remain fresh and safe to eat for weeks, or even months. Following these practices will help you keep potatoes fresh and prevent common storage issues.
Choosing the Right Storage Container
The container you use plays a significant role in how well your potatoes store.
- Paper Bags: These allow for some airflow and keep out light.
- Mesh Bags: Ideal for ventilation, these are often how potatoes are sold.
- Baskets: Open-weave baskets provide excellent air circulation.
- Cardboard Boxes: Punch a few holes for ventilation if using a box.
Avoid:
- Plastic Bags: These trap moisture and can accelerate spoilage and sprouting.
- Airtight Containers: Potatoes need to breathe; airtight containers will suffocate them.
Where NOT to Store Potatoes
Understanding where not to store potatoes is just as crucial as knowing where to store them.
- The Refrigerator: Cold temperatures convert potato starches into sugars. This can result in a sweet taste and a darker color when cooked, especially when fried. It also affects the potato’s texture.
- Direct Sunlight or Bright Kitchen Lights: As mentioned, light is the enemy. Keep them away from windowsills or under bright kitchen lamps.
- Near Onions or Fruits: Onions and certain fruits release ethylene gas, which can speed up the sprouting and spoilage process in potatoes.
What to Do with Slightly Green Potatoes
If you find a potato with just a small green spot, you can often salvage it.
- Peel: Carefully peel away the green portion, making sure to remove a bit of the flesh around it.
- Inspect: Check the rest of the potato for any signs of softness or spoilage.
- Cook: If the potato is otherwise firm and looks good, it’s generally safe to cook. However, if a large portion is green or the potato feels soft, it’s best to discard it.
Common Potato Storage Mistakes to Avoid
Many people make the same few mistakes when storing potatoes, leading to premature spoilage or greening. Being aware of these pitfalls can save you time and money.
Mistake 1: Washing Potatoes Before Storing
Potatoes have a natural protective coating. Washing them before storing introduces moisture, which can encourage mold growth and spoilage. It’s best to wash potatoes just before you use them.
Mistake 2: Storing Them in a Humid Area
Areas like under the sink or near a dishwasher can be too humid. High humidity promotes sprouting and can make potatoes rot faster. A dry pantry or basement is ideal.
Mistake 3: Storing Them with Other Produce
As noted, ethylene-producing fruits and vegetables can negatively impact potato shelf life. Keep your potatoes in their own designated cool, dark space, separate from your apples, bananas, and onions.
How to Store Different Types of Potatoes
While the general principles remain the same, some potato varieties might benefit from slight adjustments in storage.
| Potato Type | Best Storage Method | Notes |
|---|---|---|
| Russet Potatoes | Cool, dark, dry, well-ventilated (e.g., pantry bin) | Prone to sprouting; check regularly. |
| Red Potatoes | Cool, dark, dry, well-ventilated (e.g., mesh bag) | Thinner skin; handle gently to avoid bruising. |
| Fingerling Potatoes | Cool, dark, dry, well-ventilated (e.g., paper bag) | Smaller size; use them up sooner for best quality. |
| Sweet Potatoes | Cool (60-70°F/15-21°C), dark, well-ventilated (not cold) | Do NOT refrigerate; prefer slightly warmer than regular potatoes. |
| New Potatoes | Cool, dark, dry, well-ventilated (e.g., basket) | Delicate skin; use within a week or two for optimal freshness. |
People Also Ask
### How long do potatoes last in a cool, dark place?
Potatoes stored correctly in a cool, dark, and dry environment with good ventilation can last for several weeks to a few months. Factors like the potato’s initial condition and the specific temperature and humidity levels will influence their exact shelf life.
### Can I store potatoes in a plastic bag?
No, it is not recommended to store potatoes in a plastic bag. Plastic bags trap moisture, which can lead to sprouting, rot, and the development of mold. Potatoes need to breathe, so opt for breathable containers like mesh bags, paper bags, or baskets.
### What happens if you eat a green potato?
Eating a small amount of green potato is generally not harmful, though it may taste bitter. However, if a significant portion of the potato is green, or if it has a strong bitter taste, it indicates a higher concentration of solanine, which can cause digestive upset, headaches, and other symptoms if consumed in larger quantities.
### Should I refrigerate potatoes?
No, you should not refrigerate potatoes. The cold temperature of the refrigerator converts the potato