Houseplants that cleanse your home
The idea that houseplants purify indoor air traces back largely to a NASA-led study in the late 1980s, which tested how certain plants absorbed pollutants like formaldehyde, benzene, and trichloroethylene in sealed chambers. The results were promising enough that “NASA’s list of air-purifying plants” became a fixture of gardening articles ever since.
It’s worth noting a caveat modern researchers raise: Those results came from small, sealed test chambers, and follow-up studies suggest you’d need an unrealistic number of plants in an average room to meaningfully change indoor air quality on their own.
That said, plants still contribute in real ways—they release oxygen and moisture through transpiration, can modestly reduce airborne dust and certain volatile compounds, and their presence is consistently linked in psychological studies to lower stress, better mood, and improved focus.
So while a single peace lily won’t replace your air filter, plants do measurably improve the feel and, to a smaller degree, the composition of the air around you.
There is a second, tradition-based claim about plants’ cleansing properties: that certain plants clear stagnant or negative energy, invite good fortune, or protect a home spiritually.
Is it entirely possible they do both? No matter what your beliefs are, placing these plants in your home with intent will clear the air.
Snake plant (Dracaena trifasciata)
Physical: One of the most resilient air-purifying plants, the snake plant is known for converting carbon dioxide into oxygen at night—the opposite cycle of most plants—making it a popular choice for bedrooms. It’s also cited for filtering formaldehyde and benzene.
Metaphysical: Nicknamed “Mother-in-Law’s Tongue,” the snake plant is considered one of the strongest protective plants in feng shui. Its upright, blade-like leaves are believed to cut through negative energy and act as a shield against harmful intent, which is why it’s often placed near entryways or windows—the points where energy is thought to enter a home.
Aloe vera
Physical: Aloe is prized for its healing gel, is used for burns and skin irritation, and was one of the species in the NASA study associated with removing formaldehyde and benzene from the air.
Metaphysical: In many folk traditions, aloe is considered a plant of protection and luck. It’s sometimes called a “burn plant”—not just for its healing sap but also for its symbolic role in absorbing bad luck before it reaches the household. Some traditions hold that a thriving, spineless aloe by the front door invites prosperity.
Peace lily (Spathiphyllum)
Physical: Peace lilies are among the more effective plants at filtering ammonia, benzene, and formaldehyde, and they also help regulate humidity, which can ease respiratory discomfort in dry indoor air.
Metaphysical: True to its name, the peace lily is widely associated with harmony, emotional balance, and calming a turbulent home environment. It’s often gifted after a loss or during difficult transitions, believed to absorb grief and heavy emotion from a space and gently restore equilibrium.
Spider plant (Chlorophytum comosum)
Physical: Extremely easy to grow, spider plants were shown in the NASA study to remove formaldehyde and xylene effectively, and their rapid growth makes them efficient at cycling carbon dioxide into oxygen.
Metaphysical: Spider plants are considered energetically “active”—their cascading, ever-multiplying leaves symbolize continuous renewal and are thought to keep energy circulating rather than stagnating in a room. They’re a common choice for spaces that feel emotionally “stuck,” such as home offices or rooms with little natural airflow.
English ivy (Hedera helix)
Physical: English ivy ranked highly in NASA’s testing for reducing airborne mold spores and formaldehyde, making it a popular (though mildly toxic to pets, so use with care) choice for damp or humid rooms like bathrooms.
Metaphysical: Ivy has an old reputation as a guardian plant, historically grown on the exterior of homes in parts of Europe to ward off negative spirits and misfortune. Indoors, it’s associated with protection of the household and fidelity within it—a plant meant to bind good energy to a home rather than let it slip away.
Boston fern (Nephrolepis exaltata)
Physical: Boston ferns are natural humidifiers, releasing significant moisture into the air, and were noted in NASA’s research for filtering formaldehyde and xylene.
Metaphysical: Ferns are often linked to grounding and emotional softness. In some traditions, they’re kept in rooms meant for rest or reflection, believed to absorb harsh or anxious energy and replace it with a gentler, more settled atmosphere.
Rosemary (Salvia rosmarinus)
Physical: Beyond its culinary use, rosemary releases a sharp, clean aromatic compound (1,8-cineole) that some studies link to improved alertness and memory when its scent is present in a room.
Metaphysical: Rosemary has one of the oldest reputations as a purifying herb, historically burned or hung in doorways to cleanse a space of illness and evil. It’s associated with memory, protection, and mental clarity, and is a common addition to home-blessing rituals across Mediterranean and Latin American folk traditions.
Lavender
Physical: Lavender’s scent, largely from linalool, is one of the more scientifically supported aromatic compounds for reducing anxiety and improving sleep quality, making it a genuinely evidence-backed calming plant.
Metaphysical: Lavender is almost universally tied to peace, purification, and protection from negative energy in Western folk magic. It’s often kept near beds to ward off bad dreams or by windows to filter out “heavy” energy entering from outside.
Bamboo (Lucky bamboo/Dracaena sanderiana)
Physical: While not a major air purifier, bamboo is low-maintenance and thrives on minimal light—making it accessible even for spaces with poor natural airflow. And yes, it can still contribute a modest oxygen exchange.
Metaphysical: Lucky bamboo is a feng shui staple, believed to attract wealth, health, and good fortune. The number of stalks matters in this tradition—three stalks for happiness, five for wealth, and so on—and it’s frequently placed in the “wealth corner” of a home or office (traditionally the far left corner from the entrance).
Pothos (Epipremnum aureum)
Physical: An extremely hardy, low-light plant that was among the top performers in NASA’s study for removing formaldehyde, benzene, and carbon monoxide.
Metaphysical: Pothos is considered a plant of resilience and abundance, often called “money plant” in parts of Asia. Its ability to thrive almost anywhere, even in water alone, has made it a symbol of persistence and financial growth, commonly kept near entrances to draw prosperity inward.
Basil, especially holy basil (tulsi)
Physical: Basil releases aromatic oils with mild antimicrobial properties and is sometimes grown near kitchens both for culinary convenience and to help mask stronger cooking odors.
Metaphysical: In Ayurvedic and Hindu tradition, tulsi (holy basil) is considered sacred—often kept in a dedicated pot near the home’s entrance or courtyard. It’s believed to purify the surrounding air spiritually, protect the household, and create an atmosphere conducive to positive, calm energy. And its presence alone is treated as an act of daily reverence in many households.
Bringing the two traditions together
If you want to approach houseplants with both physical and metaphysical lenses in mind, a few practical habits show up across many traditions:
• Placement matters. Entryways and windows are considered energetic thresholds in feng shui and folk practice alike—protective plants like snake plant, aloe, or rue are traditionally placed there.
• Care is part of the cleansing. Many traditions hold that a neglected, dying plant reflects and even reinforces stagnant energy in a home, while a plant that’s dusted, watered, and tended regularly keeps the space—literally and symbolically—alive.
• Combine plants with other cleansing rituals. Herbs like rosemary and lavender are frequently paired with practices like opening windows, burning incense, or seasonal decluttering, treating physical tidiness and energetic cleansing as one continuous act.
