NASA’s Clean Air Study: 7 Houseplants and What to Know

You do not need an extraordinary claim to fall in love with a houseplant. A fresh leaf beside your desk, a trailing vine catching the afternoon light, or a graceful palm near your favorite chair can make greenery worth growing. Start with a Green Spider Plant or explore the seven plant profiles below, with realistic expectations and practical care at the heart of every choice.

NASA's clean-air research helped spark lasting interest in plants and indoor environments. But the familiar phrase air-purifying plants needs context: results from small experimental chambers do not show that a few potted plants will meaningfully clean the air in an ordinary home. This is a guide to the research and to enjoying seven frequently discussed houseplants, not a NASA-approved shopping list or a ranking of household air cleaners.

NASA's Clean Air Study: Interesting Science, Not a Household Prescription

The 1989 report Interior Landscape Plants for Indoor Air Pollution Abatement investigated plant systems, including leaves, roots, growing media, and associated microorganisms. Related experiments also explored engineered combinations of plants, activated carbon, and moving air. That is more nuanced than the idea that leaves alone act as miniature room filters.

A later review by Bryan Cummings and Michael Waring examined published volatile organic compound, or VOC, chamber experiments and translated their results into clean-air delivery rates. It concluded that ordinary potted plants would require impractically high densities to match typical building air exchange. Laboratory uptake is scientifically interesting, but it is not a practical reason to replace ventilation or pollution-source control with houseplants.

The seven profiles that follow are practical plant choices commonly associated with air-purifying lists. Their order is not a research ranking, and today's named cultivars should not automatically be treated as identical to plants used in historical experiments.

1. Peace Lily: Graceful Foliage and Elegant Spathes

A Spathiphyllum 'Peace Lily' brings sweeping green leaves and, when conditions support flowering, pale spathes around its flower spikes. It makes a lovely focal point on a side table with appropriate light, but it is neither a mold treatment nor a substitute for an air cleaner.

Light: Medium to bright indirect light is a useful starting point. Low-light tolerance does not guarantee flowers.
Water: Check the mix regularly and water when the upper layer begins to dry. Drain thoroughly. Do not deliberately wait for repeated severe wilting; drooping can also signal root problems.
Pets: Toxic if chewed or swallowed by cats or dogs. Peace lilies are not true lilies, but that distinction does not make them safe to eat.

2. Snake Plant: Sculptural Leaves and a Slower Watering Rhythm

The Snake Plant Starlight offers patterned, upright foliage in a compact form. Snake plants are often sold under their former Sansevieria names; the familiar trifasciata group is now placed in Dracaena.

Light: Suitable indirect light supports growth. A plant may tolerate lower light while growing more slowly, but a dark, windowless corner is not a long-term solution without suitable lighting.
Water: Allow the mix to dry between thorough waterings. Wet roots in cool, low-light conditions are a common problem.
Pets: Toxic to cats and dogs if ingested.

Do not buy a snake plant expecting improved sleep or a meaningful overnight oxygen boost. Those promises are not established by the chamber research discussed here.

3. Spider Plant: An Arching Cascade of Green

The Green Spider Plant, Chlorophytum comosum, is a cheerful choice for a shelf or secure hanging display. Established plants may produce plantlets, giving you a way to explore propagation without promising a fixed growth timetable.

Light: Bright indirect light generally supports fuller growth.
Water: Let the upper mix dry slightly, then water thoroughly and empty the saucer. Investigate moisture, water quality, and fertilizer buildup if leaf tips repeatedly brown.
Pets: The ASPCA plant directory lists this species as non-toxic to cats and dogs. Still discourage chewing: any plant material can cause digestive upset.

4. Pothos: A Living Trail for Shelves and Supports

Pothos 'Neon Queen', an Epipremnum aureum cultivar, offers bright marbled leaves that can trail or climb. This named cultivar is a current shopping example, not proof that its performance matches any historical research specimen.

Light: Bright indirect light is a good starting point for variegated foliage. Introduce stronger exposure gradually and avoid scorching sun.
Water: Allow the upper portion of the mix to dry before watering. Persistent saturation is not a shortcut to faster growth.
Pets: Toxic if chewed or ingested. Keep trailing vines out of reach, not just the pot.

5. Dracaena: Upright Greenery for a Thoughtfully Lit Office

Dracaena 'Janet Craig' pairs glossy foliage with an architectural silhouette. It can suit an office or living room, provided the position offers enough usable light. Ordinary ceiling lights should not automatically be assumed sufficient.

Light: Indirect light, avoiding harsh direct sun, is a practical starting point.
Water: Let the top portion of the mix dry, water thoroughly, and let excess drain. Avoid cold drafts and regularly inspect leaves for pests.
Pets: Toxic to cats and dogs if ingested.

6. Boston Fern: Soft Texture for a More Attentive Grower

Boston ferns belong to Nephrolepis exaltata and are appreciated for their abundant fronds. They generally demand more consistent moisture and attention than a snake plant. A bathroom can work only if it provides suitable light and growing conditions; humidity does not replace light.

Related catalog example: The pictured Fern 'Emina' is listed in our catalog as Nephrolepis exaltata 'Emina', a curly form rather than the classic arching Boston fern. Its current online purchasing availability has not been confirmed; this is a catalog reference, not an in-stock promise.

Light: Suitable indirect light, protected from scorching exposure.
Water: Keep the mix evenly moist rather than soggy. Check it often enough to avoid repeated complete drying.
Pets: The ASPCA lists Boston fern as non-toxic to cats and dogs. Confirm identity because plants casually called ferns are not interchangeable.

7. Bamboo Palm: Know the Botanical Name Before Buying

Bamboo palm commonly refers to Chamaedorea seifrizii, but common names overlap between palms. An attractive photograph or the word bamboo is not enough to establish identity or pet safety. This guide does not claim that an exact Chamaedorea seifrizii catalog match has been confirmed.

Related shopping option: Our Parlor Palm is Chamaedorea elegans, a different species shown here for its graceful indoor foliage. It should not be relabeled as C. seifrizii or described as the exact plant used in a study.

Parlor palm care: Give it indirect light, allow the top layer of mix to dry slightly, and drain excess water. Protect fronds from harsh sun and hot air from heating vents.
Pets: The ASPCA lists Chamaedorea elegans as non-toxic to cats and dogs. That species-specific listing is not a blanket safety claim for every palm or bamboo-named plant.

Build a Greener Room Around the Plant's Needs

Begin with the light, not the empty corner. A bright living room may suit a pothos or peace lily in an appropriate position; a room with no natural light needs suitable supplemental lighting. Keep plants clear of radiators, cold drafts, and unstable furniture. In homes with children or pets, consider access to foliage, potting mix, fertilizers, and hanging cords.

Choose pots with drainage or remove the nursery pot from its decorative cover for watering. Let it drain before returning it. Decorative pots shown in photos are styling examples and are included only when the selected product option says so.

What to Do When Indoor Air Is the Real Concern

The EPA emphasizes controlling pollution sources and improving ventilation. When outdoor air and weather conditions permit, appropriate ventilation can help; suitable filtration may supplement other measures. Moisture or mold problems require their underlying cause to be addressed, not a fern or peace lily placed nearby.

Keep leaves reasonably clean and avoid chronically wet potting mix. Enjoy plants as part of your room, while keeping their care separate from decisions about smoke, chemical exposure, persistent dampness, or other air-quality problems.

Frequently Asked Questions

Did NASA prove that a few houseplants purify a home?

No. The research explored pollutant removal under experimental conditions. It does not establish a practical household clean-air benefit from a few ordinary potted plants.

How many plants should I put in a room?

Choose a number that fits your available light, space, budget, and ability to provide care. Do not use a one-plant-per-100-square-feet formula as a proven household air-cleaning prescription.

Is there a NASA-approved plant collection?

This article is not a NASA endorsement of our store, products, or selected cultivars. Historical research should not be turned into a product approval claim.

Which choices are better for a home with pets?

Correctly identified spider plants, Boston ferns, and parlor palms are listed as non-toxic in the referenced ASPCA directory entries. Non-toxic does not mean edible or risk-free. Discourage chewing and contact a veterinarian if ingestion or symptoms cause concern.

Can plants replace an air purifier or solve mold?

No. Do not rely on houseplants to replace pollution-source control, ventilation, appropriate filtration, or remediation of a moisture problem.

Why grow these plants if they are not household air cleaners?

Because their shapes, colors, and changing growth can be rewarding in their own right. Choose a plant you enjoy looking at and can realistically care for. Its value does not depend on a medical or purification promise.

🔗 More Plant Care Guides from Rooted Treasures Farms

Explore our Plant Care Blog for more guidance, or compare the Green Spider Plant with the Parlor Palm for two different foliage styles. Let your next plant be a choice made with curiosity and confidence.

Explore the Green Spider Plant

Research and Safety References

The NASA report, journal review, and the Boston fern and parlor palm ASPCA pages below loaded successfully during checks on October 26, 2026. The EPA reference was identified through its official search extract, but direct access was restricted during checking. Sources support the research context and safety guidance, not an endorsement of our products.

• NASA: Interior Landscape Plants for Indoor Air Pollution Abatement, original 1989 report.
• Cummings and Waring: Potted Plants Do Not Improve Indoor Air Quality  Review published online in 2019.
• U.S. EPA: Improving Indoor Air Quality. Direct page access was restricted during our check.
• ASPCA: Boston Fern 
• ASPCA: Parlor Palm 
• ASPCA: Spider Plant Species Entry . Species listing checked through the official search extract.

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