No single plant removes airborne mold at a proven rate of 78%. No study backs up that number. This claim has spread across social media and plant blogs for years without a real source behind it. The truth is less exciting but worth knowing. Your plants can help with mold a little, but not at the level this viral claim suggests.
I spent hours digging through research databases to find where this 78% number came from. I checked PubMed and Google Scholar and read the full 1989 NASA study. That NASA study looked at chemicals like formaldehyde and benzene. It did not test mold spores at all. Someone mixed up VOC removal with mold removal along the way, and the internet ran with it. I couldn't find a single real paper that gives any plant a 78% mold removal rating.
Some proof does show that houseplants reduce mold in small ways though. Your plant's leaves have tiny textures that can trap mold spores as air moves over them. The soil in your pot also holds bacteria and fungi that compete with harmful mold for food. But these effects change a lot based on your plant type, room size, and how humid your home is. One plant in a large room will have almost zero impact on your mold spore counts.
A few plants that clean air of mold come up often in air quality talks. Snake plants, peace lilies, English ivy, and Boston ferns get the most mentions. English ivy has the best data so far. One small study showed it cut mold particles in a sealed container. But the test used a sealed box and not a real room. You can't expect the same results in your living room with open doors and air flowing through it.
If you're serious about cutting mold in your home, plants should be your last step and not your first. Start with the fixes that make the biggest real difference in your air.
Control Your Humidity First
- Target range: Keep your indoor humidity between 30% and 50% using a dehumidifier in damp areas like your basement and bathrooms.
- Monitor it: A $15 hygrometer from any hardware store shows you the exact humidity in each room so you can act fast when it spikes.
- Problem zones: Your bathrooms, kitchen, and laundry room need extra care since water vapor builds up there every single day.
Improve Your Air Flow
- Open windows: Even 15 minutes of fresh air each day cuts your indoor mold spore count more than any plant can do for you.
- Use exhaust fans: Run your bathroom and kitchen fans during and after you cook or shower to push humid air outside fast.
- HEPA filters: An air purifier with a true HEPA filter traps 99.97% of particles down to 0.3 microns, and that includes mold spores.
Add Plants as a Bonus
- Best picks: Snake plants, peace lilies, and English ivy make good extras for a home that already has proper air flow going.
- Don't overwater: Soggy soil grows mold on its own, so let your top inch dry out between drinks to avoid making the problem worse.
- Quantity helps: One plant won't do much, but 5 to 10 plants in a room may trim a small amount of mold particles over time.
The 78% mold claim makes for a great headline but it falls apart under any real review. Your houseplants add beauty, cut your stress, and may trap small amounts of mold spores from the air. But they can't replace proper humidity control and good air flow in your home. Treat your plants as one piece of a bigger plan, and you'll breathe easier knowing you're handling mold the right way.
Read the full article: Sansevieria Plant Care and Varieties
