The Top 10 Plants for Removing Indoor Toxins

Tatiana Antonelli Abella / October 7, 2010

Common indoor plants may provide a valuable weapon in the fight against rising levels of indoor air pollution. NASA scientists are finding them to be surprisingly useful in absorbing potentially harmful gases and cleaning the air inside homes, indoor public spaces and office buildings.

The indoor pollutants that affect health are formaldehyde, Volatile Organic Compounds (benzene and trichloroethylene or TCE), airborne biological pollutants, carbon monoxide and nitrogen oxides, pesticides and disinfectants (phenols), and radon.

These pollutants contribute to ‘sick building syndrome’, which causes symptoms ranging from allergies, headaches and fatigue through to nervous-system disorders, cancer and death.

Through studies conducted by NASA, scientists have identified 50 houseplants that remove many of the pollutants and gases mentioned above. Dr. B. C. Wolverton rated these plants for removing chemical vapors, ease of growth, resistance to insect problems, and transpiration (the amount of water they expire into the air). NASA, with assistance from the Associated Landscape Contractors of America, conducted a two-year study directed by Dr. B.C. Wolverton, an environmental engineer from Picayune, Mr. Wolverton has worked as a research scientist for NASA for some 20 years. His study, in the late ’80s and early ’90s, of the interaction of plants and air found that houseplants, when placed in sealed chambers in the presence of specific chemicals, removed those chemicals from the chambers.

Dr. B.C. Wolverton, researcher and author of “How to Grow Fresh Air – 50 Houseplants that Purify Your Home or Office”, conducted plant studies for NASA that determined that plants can clean pollutants in homes, offices, factories and retail outlets. Later, Wolverton expanded the study and assigned plants a rating from one to 10, based on a plant’s ability to remove chemical vapors or indoor air toxins, ease of growth and maintenance, resistance to insect infestation and the rate at which water evaporates from the leaves.

Top ten plants for removing formaldehyde, benzene, and carbon monoxide from the air.

 

1. Areca Palm (Chrysalidocarpus lutescens)

Also called the “Butterfly Palm”. An upright

houseplant that is somewhat vase shaped. Specimen plants can

reach 10 to 12 foot in height. Prefers a humid area to avoid

tip damage. Requires pruning. When selecting an Areca palm

look for plants with larger caliber trunks at the base of the

plant. Plants that have pencil thin stems tend to topple over

and are quite difficult to maintain.

2. Lady Palm (Rhapis excelsa)

Also called the “Lady Palm”, this durable palm

species adapts well to most interiors. The Rhapis are some of

the easiest palms to grow, but each species has its own

particular environment and culture requirements. The “Lady

Palm” grows slowly, but can grow to more than 14′ in height with

broad clumps often having a diameter as wide as their

height.

 

3. Bamboo palm (Chamaedorea seifrizii)

Also called the “reed palm”, this palm prefers

bright indirect light. New plants will lose of some interior

foliage as they acclimate to indoor settings. This plant likes

to stay uniformly moist, but does not like to be over-watered

or to sit in standing water. Indoor palms may attract spider

mites which can be controlled by spraying with a soapy

solution.

 

4. Rubber Plant (Ficus robusta)

Grows very well indoors, preferring semi-sun

lighting. Avoid direct sunlight, especially in summer. Young

plants may need to be supported by a stake. The Ficus grows to

8’ with a spread of 5’. Wear gloves when pruning, as the milky

sap may irritate the skin. Water thoroughly when in active

growth, then allow the soil to become fairly dry before

watering again. In winter keep slightly moist.

 

5. Dracaena “Janet Craig” (Dracaena deremensis)

The Dracaena grows to 10’ with a spread of 3’.

Easy to grow, these plants do best in bright indirect sunlight

coming from the east/west. They can adapt to lower light

levels if the watering is reduced. Keep the soil evenly moist

and mist frequently with warm water. Remove any dead leaves.

Leaf tips will go brown if the plant is under watered but this

browning may be trimmed.

6. Philodendron (Philodendron sp.)

One of the most durable of all house plants.

Philodendrons prefer medium intensity light but will tolerate

low light. Direct sun will burn the leaves and stunt plant

growth. This plant is available in climbing and non-climbing

varieties. When grown indoors, they need to be misted

regularly and the leaves kept free of dust. Soil should be

evenly moist, but allowed to dry between watering.

 

7. Dwarf Date Palm (Phoenix roebelenii)

A hardy, drought-tolerant and long-lived plant,

the Dwarf Date Palm needs a bright spot which is free of

drafts. It grows slowly, reaching heights of 8-10’. The Dwarf

Date Palm should not be placed near children’s play areas

because it has sharp needle-like spines arranged near the base

of the leaf stem. These can easily penetrate skin and even

protective clothing.

 

8. Ficus Alii (Ficus macleilandii “Alii”)

The Ficus Alii grows easily indoors, and

resists insects. It prefers a humid environment and low to

medium light when grown indoors. The Ficus Aliii should not be

placed near heating or air conditioning vents, or near drafts

because this could cause leaf loss. Soil should be kept moist

but allowed to dry between watering.

 

9. Boston Fern (Nephrolepis exaltata “Bostoniensis”)

The Boston fern grows to 4’ in height with a

spread up to 5’. It has feathery ferns which are best

displayed as a hanging plant. It prefers bright indirect

sunlight. Keep the soil barely moist and mist frequently with

warm water. This plant is prone to spider mites and whitefly

which can be controlled using a soapy water spray. Inspect new

plants for bugs before bringing them home.

 

10. Peace Lily (Spathiphyllum “Mauna Loa”)

The Peace Lily is a compact plant which grows

to a height of 3’ with a 2’ spread. This hardy plant

tolerates neglect. It prefers indirect sunlight and high

humidity, but needs to be placed out of drafts. For best

results, the Peace Lily should be thoroughly watered, then

allowed to go moderately dry between waterings. The leaves

should be misted frequently with warm water.

 

Dr. B.C.Wolverton’s book is available online:  “

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