Understanding Mold in Cheese: What You Need to Know
It's a question many cheese lovers have pondered at some point: why do some cheeses seem to attract mold more than others? The answer lies in a combination of the cheese's ingredients, its aging process, and its moisture content. Not all mold on cheese is bad, of course – some is intentionally introduced and even celebrated, like in blue cheese. However, understanding which cheeses are more susceptible to undesirable mold growth can help you store your cheese properly and identify when it's best to toss it.
Factors Contributing to Mold Proneness
Several key factors make certain cheeses more prone to mold development:
- High Moisture Content: Cheeses with a higher water content provide a more hospitable environment for mold spores to germinate and grow. Think of soft, creamy cheeses.
- Surface Ripening: Cheeses that are aged on their surface, often with washes or rinds that encourage microbial activity, are naturally more likely to develop mold.
- Unpasteurized Milk: While not a direct cause, milk that hasn't been pasteurized can sometimes carry a wider array of microorganisms, which can include mold spores.
- Storage Conditions: Improper storage, such as leaving cheese unwrapped or in too humid an environment, can accelerate mold growth.
Cheeses More Prone to Mold
Based on the factors above, here are some types of cheeses that you'll find are more commonly affected by mold:
Soft Cheeses
Soft cheeses, due to their higher moisture content, are prime candidates for mold growth. These include:
- Brie and Camembert: These bloomy-rind cheeses are designed to have a mold rind (Penicillium candidum or camemberti), but they can also be susceptible to other, unwanted molds if not stored correctly.
- Cream Cheese: Its high moisture and lack of a protective rind make it very prone to surface mold.
- Ricotta and Mascarpone: These fresh, unripened cheeses have a very short shelf life and will quickly show mold if not consumed promptly.
- Goat Cheese (Chevre): Especially fresh varieties, their high moisture makes them susceptible to mold.
Semi-Soft Cheeses
These cheeses have a bit more structure than soft cheeses but still hold a good amount of moisture.
- Havarti and Monterey Jack: While generally firm, if left exposed or for extended periods, these can develop mold.
- Mozzarella (Fresh): Similar to ricotta, fresh mozzarella has a high water content and a short shelf life, making it prone to mold.
Blue Cheeses
Blue cheeses are intentionally inoculated with specific types of mold (Penicillium roqueforti or glaucum) to create their characteristic veins and flavor. However, these beneficial molds can sometimes coexist with or be outcompeted by undesirable molds.
- Roquefort, Gorgonzola, Stilton: While the blue veins are a desirable mold, other fuzzy or discolored spots on the surface could indicate spoilage.
Washed-Rind Cheeses
These cheeses are washed with brine, beer, wine, or spirits during their aging process. This encourages the growth of specific bacteria (like Brevibacterium linens) and yeasts, which contribute to their pungent aroma and distinctive rinds. However, this environment can also be conducive to unwanted mold growth.
- Limburger, Époisses, Taleggio: Their unique rinds are a result of controlled microbial activity, but they can also be a breeding ground for other molds if not managed properly.
When is Mold Safe to Eat?
This is a crucial distinction to make. For some cheeses, mold is an integral part of their identity:
The blue veins in blue cheese are a specific, intentionally introduced mold and are perfectly safe and desirable.
The white, fuzzy rind on cheeses like Brie and Camembert is also an intentionally cultivated mold (Penicillium candidum) and is meant to be eaten.
However, for other cheeses, especially those that are not meant to have mold, the presence of fuzzy, green, black, or pink mold typically indicates spoilage and should be avoided. The mold can produce toxins, and its growth can degrade the texture and flavor of the cheese.
When to Discard Moldy Cheese
As a general rule of thumb, if you see mold on a cheese that isn't supposed to have it, and it's fuzzy and appears on the surface, it's usually best to discard the entire piece, especially with soft, porous, or crumbly cheeses. For hard cheeses, like cheddar or Parmesan, you might be able to cut away a generous portion (at least an inch around and below the mold spot), but this is not foolproof.
Storing Cheese to Prevent Unwanted Mold
Proper storage is your best defense against unwanted mold:
- Wrap it Right: Use cheese paper or parchment paper, then loosely place it in a plastic bag or container. This allows the cheese to breathe while preventing it from drying out or becoming overly humid.
- Refrigerate: Always store cheese in the refrigerator, ideally in a cheese drawer or the crisper.
- Separate Cheeses: If possible, store stronger-smelling cheeses separately to prevent their flavors from transferring.
- Inspect Regularly: Check your cheese periodically for any signs of unwanted mold.
Frequently Asked Questions (FAQ)
How can I tell if the mold on my cheese is safe?
If your cheese is supposed to have mold (like blue cheese or bloomy-rind cheeses like Brie), the mold will be characteristic of that cheese – blue veins or a white, fuzzy rind. If you see any other colors of fuzzy mold (green, black, pink, orange) on a cheese that shouldn't have it, or if the mold is slimy or unusually textured, it's likely spoiled.
Why do soft cheeses get moldy faster?
Soft cheeses have a higher moisture content, which creates a more favorable environment for mold spores to germinate and grow. They also often lack a protective, hard rind that can inhibit mold development.
Can I just cut off the moldy part of the cheese?
For hard, dense cheeses like cheddar or Parmesan, you can often cut away a generous portion (at least an inch around and below the moldy spot) and still be safe. However, for soft, crumbly, or porous cheeses, mold can penetrate deeply, making it unsafe even if you cut away the visible part. In these cases, it's best to discard the entire cheese.
Why does my cheese sometimes get moldy even when I store it properly?
Even with proper storage, mold spores are present in the air and can eventually settle on cheese. The key is to slow down their growth. Factors like the type of cheese, its age, and the specific strains of mold present can all influence how quickly mold appears.
