Cigar Plume vs Mold: How to Tell the Difference
The difference is simple: plume is a harmless, fine white crystalline dust that appears on well-aged cigars, while mold is a fuzzy, colored (often blue-green) growth that means the cigar is spoiled. Plume brushes off cleanly and is a good sign; mold clings, smells musty, and requires you to discard the cigar. Knowing which you are looking at saves you from either throwing away a good cigar or smoking a bad one.
What is plume?
Plume (also called bloom) is a natural result of aging. Over time, the oils in the tobacco slowly rise to the surface and crystallize, leaving a fine white or grayish powder on the wrapper. It is a sign a cigar has been well stored and aged. Plume is harmless, has no real smell, and brushes off with a soft cloth or your finger, leaving the wrapper intact.
What is mold?
Mold grows when cigars are kept too humid or too warm. It is a living growth, not a crystallized oil, and it damages the cigar. Mold means the cigar is spoiled and should not be smoked.
How to tell them apart
- Color: plume is white or grayish; mold is often blue-green, but can be white and fuzzy.
- Texture: plume is a fine, flat, powdery dust; mold is fuzzy, raised, and web-like.
- Pattern: plume is even and dusty; mold appears in spots or patches.
- Smell: plume is odorless or smells of tobacco; mold smells musty or damp.
- Removal: plume brushes off cleanly; mold leaves a stain or mark and may have penetrated the wrapper.
The wipe test
Gently brush the deposit. Plume wipes away easily, leaving a clean wrapper. Mold smears, leaves a stain, and clings. If in doubt and it smells musty or is colored, treat it as mold.
What to do about mold
If you find mold:
- Remove and discard the affected cigar(s).
- Inspect the neighboring cigars closely.
- Wipe out the humidor and check your humidity, it is likely too high.
- Lower the humidity toward 65 percent and improve air circulation.
Preventing mold
- Keep humidity at 65 to 70 percent, not higher.
- Keep the humidor cool; heat plus moisture invites mold.
- Use distilled water only in refillable humidifiers.
- Do not overcrowd cigars, allow some airflow.
Where to go next
Keep conditions right with ideal humidity for cigars, understand spoilage in do cigars go bad, and store correctly with how to store cigars.
Frequently asked questions
What is the difference between cigar plume and mold?
Plume is a harmless white crystalline dust from aging that brushes off cleanly. Mold is a fuzzy, colored growth, often blue-green, that smells musty and spoils the cigar.
Is plume on a cigar safe to smoke?
Yes. Plume is crystallized tobacco oils from proper aging. Simply brush it off with a soft cloth; the cigar underneath is fine and often well-aged.
How do I know if it's mold on my cigar?
Mold is fuzzy and raised, often blue-green, appears in spots, smells musty, and smears or stains when wiped rather than brushing off cleanly like plume.
What should I do if I find mold in my humidor?
Discard the affected cigars, inspect the neighbors, wipe out the humidor, lower the humidity toward 65 percent, and improve airflow to prevent it returning.
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