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Cigar 101

Tips for Preventing Cigar Mold

Shane K. K's picture

Shane K.

There’s nothing worse than anticipating a special occasion when it’s finally time to fire up that premium cigar you’ve been hanging onto for months, only to discover your precious smoke doesn’t quite look the same as when you laid it down in your humidor. Why do my cigars appear to have a coating over them – is this normal? Depends on what the coating is. 

Cigar Plume Is Okay

Plume (also called cigar bloom) is a white or gray crystalline substance that simply derives from the natural oils in a cigar’s tobaccos. Plume appears as white spots on your cigars and is harmless. It indicates that your humidor is working perfectly and that your cigars are aging – a welcome condition in any aficionado’s collection. Plume can be easily dusted off the cigar’s surface and will never form on the foot of your cigars.

What Does Cigar Mold Look Like?

Cigar mold, on the other hand, can be a catastrophic condition for any humidor or cigar collection. Cigar mold is bluish-green in color and often exhibits a fuzzy, moss-like texture accompanied by a musty odor. If you check on your cigars regularly, chances are good you’ll catch any potential instances of mold before they really have a chance to spread, but recognizing them is key. Mold can grow anywhere on your cigars, but if you notice anything growing on the foot, there’s a very high likelihood it’s mold. If you suspect you’ve got a moldy cigar, immediately remove it from the humidor. It’s also wise to remove any cigars in close proximity to the moldy one(s) as a precaution. Carefully inspect the inside of your humidor to make sure mold is not growing on the interior of the box itself. Toss out any moldy cigars.

What Causes Cigar Mold?

Cigars can get moldy due to a variety of circumstances. Most common are either over-humidifying your cigars or using non-distilled water in your humidor. Cigars should be kept at 70% RH (relative humidity). Storing your smokes above 70% RH greatly increases the chances mold will grow. We often recommend storing your cigars in the range of 65 to 70% RH. This will lower the probability for mold to set in.

The Best Ways to Prevent Cigar Mold

Following are few helpful tips for preventing mold in the first place. Maintaining a humidor is less work than watering a house plant, but caring for your cigars begins with an attentive approach.

Invest in a Digital Hygrometer

Insure that you’re storing your smokes at an optimal humidity level with a quality hygrometer. Digital hygrometers are far more accurate than their analog counterparts, for example. Digital hygrometers typically take a watch battery and will give you a very accurate reading. Even if your humidor came with an analog hygrometer, relying on a digital reading is a sensible move. Knowing precisely what your humidity level is prevents the likelihood of over-humidification.

Only Use Distilled Water in Your Humidor

More importantly, make sure you’re only using distilled water or propylene glycol solution to fill the reservoir in your humidor. Using tap water, or even a fancy brand of bottled water, can lead to mold in your humidor. Distilled water greatly reduces the risk mold will take root in your cigars or humidor. If you prefer a more hands-off approach, humidity pouches also make a great alternative to a traditional humidification reservoir. Humidity pouches don’t need to be refilled. Simply add the appropriate number of pouches to your humidor for the number of cigars you’re storing and replace them when their humidity is exhausted (each pouch will stiffen up to indicate there is no moisture left).

Rotate Your Cigars

Rotate your cigars on a weekly or bi-weekly basis so that the same cigar aren’t always buffered up against the humidification unit. Move the bottom rows to the top and vice versa periodically. This exercise also gives you the chance to regularly inspect your collection, lowering the risk that an adverse condition can go unnoticed for extended period of time. 

Don’t Over-Pack Your Humidor

Leave a little extra space in your box, roughly 20-25%, so that moisture and air can flow a bit more freely around your cigars. Doing so insures your humidor won’t be overwhelmed with the collection you’ve got going.

Buy Your Cigars from a Trustworthy Source

Buying cigars from a street vendor during an exotic vacation is generally not a good idea. Stick to getting your cigars from a reputable retailer or online shop and avoid getting stuck with cigars that don’t burn correctly, are made from poor-quality tobaccos, or worse – cigars that are infected with mold. Introducing even a single moldy cigar into a pristine humidor can ruin your entire collection, plus the box itself.

Can I Smoke a Moldy Cigar?

Knowingly firing up a moldy cigar is never a good idea. Some types of mole may be harmless, but many are toxic, and none will provide any benefit to a cigar. If one of your favorite or oldest cigars is unfortunately contaminated with mold, toss it out. While some experts advise the use of isopropyl alcohol to eradicate mold spores either on your cigars or in your humidor, we generally think it’s best to part ways with any moldy product.

The only way to know if your efforts to get rid of mold work is to let a good amount of time pass after wiping down your humidor with isopropyl alcohol and re-humidifying the box (without cigars inside it) for an extended period. It takes time for mold to show up and you definitely don’t want to load up a questionable humidor with a new batch of expensive cigars if there’s a chance the mold could recur and continue to infect your future collection. Don’t take any chances.

Arm yourself with a bit of knowledge and patiently age your favorite smokes from Arturo Fuente, Ashton, Padron, or many more brands in a worry-free environment.

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