The idea that houseplants purify indoor air gained mainstream attention after a 1989 NASA study found that certain plants could remove pollutants like formaldehyde, benzene, and trichloroethylene from sealed chambers. While subsequent research has tempered expectations about how many plants you'd need to notice a meaningful difference, there's no doubt that houseplants improve mood, reduce stress, and make living spaces more pleasant.
Here are seven excellent indoor plants — chosen for their ease of care, beauty, and well-documented properties.
1. Snake Plant (Sansevieria trifasciata)
Also known as "mother-in-law's tongue," the snake plant is practically indestructible and works in low-light conditions. It's one of the few plants that continues to produce oxygen at night (most plants do this only during daylight), making it a popular choice for bedrooms.
Care: Water every 2–6 weeks. Tolerates low light but grows faster in bright, indirect light. Avoid overwatering — root rot is the only common cause of failure.
2. Spider Plant (Chlorophytum comosum)
One of the most adaptable and forgiving houseplants available. Spider plants are fast growers and produce cascading "spiderettes" that can be propagated easily into new plants. They've been studied for their ability to absorb carbon monoxide and other common indoor pollutants.
Care: Water moderately. Does well in a range of light conditions. Happy in hanging baskets where its trailing stems can be displayed.
3. Peace Lily (Spathiphyllum wallisii)
One of the few flowering plants on this list, the peace lily produces elegant white blooms and thrives in the kind of dim, low-light conditions that defeat most plants. The NASA study specifically identified it as effective at filtering several airborne toxins.
Care: Keep the soil lightly moist. Droops dramatically when thirsty but recovers quickly when watered. Note: mildly toxic to pets and children if ingested.
4. Pothos (Epipremnum aureum)
If you've ever been given a "starter plant," it was probably a pothos. This fast-growing vine is nearly impossible to kill and trails beautifully from shelves or hanging planters. It tolerates fluorescent light, making it ideal for offices.
Care: Water when the top inch of soil feels dry. Grows in almost any light condition. Can be trimmed and propagated in water indefinitely.
5. Rubber Plant (Ficus elastica)
With its large, glossy, deep-green leaves, the rubber plant is a bold and elegant statement in any room. It grows into a substantial indoor tree if given space and is particularly effective at absorbing CO₂ and releasing oxygen due to its large leaf surface area.
Care: Bright, indirect light is best. Allow soil to dry out between waterings. Wipe leaves occasionally to remove dust and maximize photosynthesis efficiency.
6. Aloe Vera
Aloe vera doubles as both a beautiful succulent and a functional first-aid plant. Beyond its many well-documented skin benefits, aloe vera is a low-maintenance plant that stores water in its leaves and needs minimal watering.
Care: Bright light (direct or indirect), watering every 2–3 weeks. Plant in cactus/succulent mix in a pot with drainage holes. One of the best plants for beginners.
7. Boston Fern (Nephrolepis exaltata)
Boston ferns are classic houseplants with lush, feathery fronds that look stunning in hanging baskets or on plant stands. They act as natural humidifiers, releasing moisture into the air through transpiration — particularly useful in centrally heated or air-conditioned rooms.
Care: They need more attention than others on this list: keep soil consistently moist, mist regularly in dry conditions, and give them bright, indirect light. Avoid heating vents.
🏡 How Many Plants Do You Need?
Researchers at Drexel University suggested you'd need between 10 and 1,000 plants per square metre to match the air filtration capacity of a mechanical ventilation system. That said, even a few plants in key spots — bedroom, living room, workspace — offer real benefits for wellbeing, focus, and humidity levels. Start with one or two and build from there.
General Tips for Healthy Houseplants
- Right light for the right plant: Most houseplant problems come from incorrect light placement, not watering mistakes.
- Drainage matters: Always use pots with drainage holes, and never let plants sit in standing water.
- Overwatering is the #1 killer: When in doubt, wait another day or two before watering.
- Dust the leaves: Dusty leaves reduce photosynthesis. A gentle wipe with a damp cloth every few weeks makes a real difference.
- Feed in the growing season: A half-strength liquid fertiliser once a month in spring and summer is usually sufficient.