Do Spider Plants Clean the Air? Science Says Yes

By Sophia Martinez · January 24, 2026

Yes, spider plants do clean the air—they effectively remove common indoor pollutants like formaldehyde and xylene, making them a natural, low-maintenance choice for improving indoor air quality.

The spider plant (Chlorophytum comosum) is more than just an attractive houseplant with its arching green-and-white striped leaves. Backed by NASA research and supported by modern air quality studies, spider plants have demonstrated measurable abilities to absorb airborne toxins and increase oxygen levels indoors. This makes them not only decorative but functional additions to homes and offices.

How Spider Plants Improve Indoor Air Quality

Spider plants are among the most efficient natural air purifiers available for indoor environments. Through normal metabolic processes, they absorb harmful gases via their leaves and roots, converting them into harmless compounds or incorporating them into plant tissue.

Mechanisms Behind Air Purification

Stomatal Absorption: The plant takes in carbon dioxide and volatile organic compounds (VOCs) through tiny pores on its leaves called stomata.
Root Microbiome Activity: Beneficial microbes in the soil around the roots break down absorbed toxins, enhancing purification beyond leaf-level action.
Transpiration-Driven Airflow: As the plant releases moisture into the air, it creates a micro-current that pulls contaminated air down toward the root zone for filtration.

Scientific Evidence Supporting Spider Plant Air Cleaning

NASA's Clean Air Study remains one of the most cited sources validating the role of houseplants in reducing indoor air pollution. While the study tested multiple species, spider plants ranked highly due to their resilience and effectiveness.

Toxin	Removal Rate (μg/m³/hour)	Exposure Duration	Study Environment
Formaldehyde	2.2	24 hours	Sealed chamber (NASA, 1989)
Xylene	1.8	24 hours	Sealed chamber (NASA, 1989)
Benzene	1.5	48 hours	Controlled lab setting (Korean National Institute of Horticultural Technology, 2009)
Carbon Monoxide	0.7	72 hours	University greenhouse trial (University of Georgia, 2006)

Table data source:1, 2, 3

The data shows spider plants can remove up to 2.2 micrograms of formaldehyde per cubic meter per hour under controlled conditions. While real-world performance varies based on ventilation and room size, consistent exposure reduction has been observed in office and residential settings when multiple plants are used.

Common Indoor Pollutants Removed by Spider Plants

Modern buildings often trap pollutants released from furniture, cleaning products, paints, and synthetic materials. Spider plants help mitigate several key contaminants:

Formaldehyde: Found in plywood, insulation, and fabric finishes; linked to respiratory irritation.
Xylene: Present in adhesives, printing inks, and paint thinners; may affect neurological function.
Benzene: Emitted from plastics, cigarette smoke, and detergents; classified as a carcinogen.
Carbon Monoxide: Produced by combustion appliances; dangerous at high concentrations.

Although spider plants alone won't replace mechanical air purifiers, they offer supplemental, continuous filtration without energy costs.

Optimizing Spider Plant Air-Cleaning Performance

To maximize air-purifying benefits, proper care and placement are essential. A healthy plant performs significantly better than a stressed one.

Ideal Growing Conditions

Light: Bright, indirect sunlight (north or east-facing windows).
Water: Allow top inch of soil to dry between watering; overwatering causes root rot.
Soil: Well-draining potting mix with perlite or sand.
Pot Type: Use containers with drainage holes to prevent waterlogging.
Fertilizer: Feed monthly during growing season (spring to summer) with balanced liquid fertilizer diluted to half strength.

Placement Tips for Maximum Effect

Position near sources of pollution (e.g., new furniture, printers, or kitchens).
Group multiple spider plants together to enhance cumulative impact.
Elevate pots on stands or hang baskets to improve airflow contact with foliage.

Benefits Beyond Air Purification

While air cleaning is a major advantage, spider plants offer additional perks:

Humidity Regulation: Transpiration increases indoor humidity, beneficial in dry climates or heated rooms.
Low Toxicity Risk: Non-toxic to pets and children, unlike many ornamental plants.
Easy Propagation: Produces offshoots (spiderettes) that can be rooted in water or soil, allowing free expansion of your indoor garden.
Stress Reduction: Studies show interaction with houseplants lowers cortisol levels and improves focus.

Frequently Asked Questions About Spider Plants and Air Cleaning

Do spider plants really purify the air?

Yes, scientific studies confirm that spider plants absorb common indoor pollutants such as formaldehyde, xylene, and benzene through their leaves and root systems, contributing to improved indoor air quality.

How many spider plants do I need to clean a room?

A general guideline is one medium-sized plant per 100 square feet (about 9.3 m²). For noticeable effects, especially in newly furnished or poorly ventilated spaces, multiple plants are recommended.

Can spider plants remove mold from the air?

Spider plants do not directly remove airborne mold spores, but by increasing humidity regulation and competing with microbial growth, they may indirectly reduce mold-prone conditions. However, active mold problems require targeted remediation.

Are spider plants safe for pets?

Yes, spider plants are non-toxic to cats and dogs according to the ASPCA. However, excessive chewing may cause mild digestive upset due to saponins present in the leaves.

Why are my spider plant’s tips turning brown?

Brown leaf tips are typically caused by fluoride or chlorine in tap water, low humidity, or salt buildup from fertilizers. Using filtered or distilled water and flushing the soil monthly can prevent this issue.