For the next few months many of us are going to be stuck inside as the snow falls and the cold winds blow. So I thought this would be a great time to talk about how certain  houseplants can clean the air in our homes and offices and make us feel  better.

A study sponsored by NASA and conducted by Dr. Bill Wolverton concluded that houseplants are able to clean the air of harmful chemical toxins such as benzene, formaldehyde, and trichloroethylene; unfortunately none have been shown to remove tobacco smoke from the air. At the time of the study, NASA was attempting to find ways to purify the atmosphere in future space stations so humans could inhabit them for a prolonged period. Today we can all benefit from this research by using certain easy to find houseplants to remove harmful gases and purify our environment.

It’s been known for quite a while that plants remove carbon dioxide from the air and add oxygen. Now we know that plants also remove some air born pollutants when they engage in photosynthesis and that the soil in plants can directly absorb certain environmental toxins.  Air-born pollutants come from such common items as carpets, paint, copy machines, manufactured wood products, pesticides, upholstery, laminated counters, plastic wallpaper, detergents and even paper towels. These materials are said to “off-gas” toxins into the interior spaces of homes, offices, & buildings. Biologic air-born contaminants such as pollen, mold, bacteria, and viruses grow in humidifiers, air conditioners, ducts, carpets, ceilings, & tiles.

It’s interesting that new energy efficient tightly sealed buildings, which are better insulated than older buildings and furnished with more up to date synthetic products, have more air quality problems than older drafty buildings. The new and better construction not only helps to conserve heating and air conditioning, it also traps toxic gases and prevents them from escaping from the building. This problem has been given the name “sick building syndrome.” People working or living in areas where the air is stale and the circulation poor, may experience headaches, nausea, fatigue, sore throat, and eye irritation. Using the proper number and the correct variety of houseplant can greatly reduce air quality problems and the illnesses caused by them.

NASA recommends using at least 15 to 18 houseplants to purify the air in a 1,800 square foot area. The pot sizes of these plants should be at least 6”-8” in diameter. The houseplants that the NASA study recommends originally grew in areas that received only indirect filtered light. These low lightWhen you select “Low Light” a list of the most adaptive plants in our database appears. These plants can live in lighting conditions too low to support any other plants in our database, but will grow faster in medium and high light. Variegation (color) in the leaves is often lost in low light. A plant in low light needs less water and fertilizer than the same plant in better light. Place a low-light plant within 2-3 ft. of a window with a northern exposure, 3-5 ft. of a window with an eastern exposure, 4-10 ft. of a window with a western exposure, and 10-18ft. of a window with a southern exposure. A low light area has between 50-150 ft. candles of light. The best low light house plants are: Chinese Evergreen, Dracaena Janet Craig, Peace Lily, Heart leaf Philodendron. conditions helped the plants develop a very efficient method of photosynthesis, which in turn allows them to efficiently process the gases in the air. The soil and the roots of a plant aid in this process and are especially helpful if you remove the bottom leaves so more of the soil surface is open to the air.

Probably all house plants have some environmental benefits, but as of right now, the top Clean Air PlantsCertain houseplants clean the air of harmful chemicals. are considered to be:

Bamboo Palm: A beautiful compact palm, native to Mexico and Central America, that is excellent for low lightWhen you select “Low Light” a list of the most adaptive plants in our database appears. These plants can live in lighting conditions too low to support any other plants in our database, but will grow faster in medium and high light. Variegation (color) in the leaves is often lost in low light. A plant in low light needs less water and fertilizer than the same plant in better light. Place a low-light plant within 2-3 ft. of a window with a northern exposure, 3-5 ft. of a window with an eastern exposure, 4-10 ft. of a window with a western exposure, and 10-18ft. of a window with a southern exposure. A low light area has between 50-150 ft. candles of light. The best low light house plants are: Chinese Evergreen, Dracaena Janet Craig, Peace Lily, Heart leaf Philodendron. areas. Indoors, a Bamboo or Reed Palm as it is sometimes called, may reach a height of 5-7ft. and a width of 3-5ft. with multiple reed-like stems growing in clumps. This palm is hardier than an Areca Palm and less expensive than a Kentia Palm. It’s effective in removing formaldehyde and xylene from the air.

Chinese Evergreen: A Chinese Evergreen, or Aglaonema, is a hardy hybrid of two plants in the Aroid family that originally came from the subtropics of Southeast Asia. Chinese Evergreens can be used as an upright table plant or, as it gets larger, a bushy floor plant.  All of the many varieties of these plants have long shiny leathery leaves with unique patterns of green, gray, and cream. It’s effective in removing benzene and formaldehyde from the air.

Dracaena Janet Craig:  A Dracaena Janet Craig, native to tropical Africa, grows well in low lightWhen you select “Low Light” a list of the most adaptive plants in our database appears. These plants can live in lighting conditions too low to support any other plants in our database, but will grow faster in medium and high light. Variegation (color) in the leaves is often lost in low light. A plant in low light needs less water and fertilizer than the same plant in better light. Place a low-light plant within 2-3 ft. of a window with a northern exposure, 3-5 ft. of a window with an eastern exposure, 4-10 ft. of a window with a western exposure, and 10-18ft. of a window with a southern exposure. A low light area has between 50-150 ft. candles of light. The best low light house plants are: Chinese Evergreen, Dracaena Janet Craig, Peace Lily, Heart leaf Philodendron. and needs very little water. This particular dracaena has sword shaped, leathery, dark green shiny leaves that are about 3” wide and 2ft. in length. It’s effective in removing formaldehyde, benzene, and xylene from the air.

Peace Lily: A lovely flowering plant, sometimes referred to as a Spathyphylum, Peace Lilies have very large, glossy, dark green leaves and impressive white flowers that often last for weeks. The flowers are really spathes or modified leaves.  Since a Peace Lily originally grew on the floors of rain forests, it is one of very few indoor plants that bloom even in medium to low lightWhen you select “Low Light” a list of the most adaptive plants in our database appears. These plants can live in lighting conditions too low to support any other plants in our database, but will grow faster in medium and high light. Variegation (color) in the leaves is often lost in low light. A plant in low light needs less water and fertilizer than the same plant in better light. Place a low-light plant within 2-3 ft. of a window with a northern exposure, 3-5 ft. of a window with an eastern exposure, 4-10 ft. of a window with a western exposure, and 10-18ft. of a window with a southern exposure. A low light area has between 50-150 ft. candles of light. The best low light house plants are: Chinese Evergreen, Dracaena Janet Craig, Peace Lily, Heart leaf Philodendron.. It’s effective in removing formaldehyde, benzene, and trichloroethylene from the air.

Snake Plant: Snake Plants, which are also known as Sansiviera or Mother in Law’s Tongue, originally came from South Africa. They are another one of those hardy almost impossible to kill plants that thrive on neglect. Certain varieties such as “Trifasiata” have long, thick, stiff, upright leaves that can grow as tall as 4ft. while other varieties such as the Hahni have very short compact leaves that are only 4” tall. Snake Plants are effective in removing formaldehyde and xylene from the air.

English Ivy: English Ivy can be found in over 100 different sizes, colors, and leaf shapes. This beautiful draping plant is highly poisonousPlants are a great addition to homes and offices, but it’s important to know whether your plants are dangerous to children, pets, or even adults. Some plants contain chemicals such as oxalates, solanine, glycosides, or alkaloid lycorine that may cause vomiting, nausea, diarrhea, swelling and redness of the mouth, throat, and lips, and trouble breathing. Touching parts of certain plants, especially the sap, may cause various skin irritations. The weight and age of the human or pet involved, and the part and amount of plant eaten determine how severe the reaction to the toxins will be. Although plants may be listed as non-toxic, they can still cause individual allergic reactions. If there is any question after a houseplant has been ingested or touched immediately call the Poison Control Center 1-800-222-1222 The Handbook of Poisonous and Injurious Plants [Paperback]is an excellent reference to keep around if you have young children and pets., so be careful to keep it away from young children and pets. English Ivy is effective in removing formaldehyde, benzene, and xylene from the air.

Dracaena Marginata: A Dracaena Marginata can be used as a table plant, a short bush, or a tall tree with multiple canes and hundreds of long thin green leaves.  A Marginata, or Dragon Tree, is an easy-care durable plant well suited for offices and homes and a favorite choice of interior designers. It’s effective in removing formaldehyde, benzene, and xylene from the air.

Dracaena Warnekii: Yet another dracaena, a Warnekii, with its long, pointed, green and white striped leaves is one of the few colorful plants that can survive in low lightWhen you select “Low Light” a list of the most adaptive plants in our database appears. These plants can live in lighting conditions too low to support any other plants in our database, but will grow faster in medium and high light. Variegation (color) in the leaves is often lost in low light. A plant in low light needs less water and fertilizer than the same plant in better light. Place a low-light plant within 2-3 ft. of a window with a northern exposure, 3-5 ft. of a window with an eastern exposure, 4-10 ft. of a window with a western exposure, and 10-18ft. of a window with a southern exposure. A low light area has between 50-150 ft. candles of light. The best low light house plants are: Chinese Evergreen, Dracaena Janet Craig, Peace Lily, Heart leaf Philodendron. conditions though does better in medium light. This is another easy care plant that is good for beginners. A Dracaena Warneki is effective in removing trichloroethylene, benzene, and xylene from the air.

Golden Pothos: This highly adaptable glossy- leafed plant with heart shaped leaves is one of our most common indoor houseplants and with good reason. It is easy to care for, grows almost anywhere, makes a lovely sitting, hanging, or climbing plant, and is very forgiving. It’s effective in removing formaldehyde from the air.

Ficus Benjamina: Ficus trees have the reputation of being temperamental high lightVery few houseplants should be placed in direct sun. High light refers only to bright indirect light since direct sun often burns the leaves of indoor houseplants. An area that is too hot and dry encourages Spider Mites and causes blooms to quickly fade. A northern exposure really doesn't provide enough light for high light plants. These plants need to be placed directly in front of an east-facing window, within 1-3 feet of a west-facing window, and within 5 ft. of a south facing window. A high light area has over 300 ft. candles of light. plants, but today there are new hardy varieties that will grow in almost any location. A Ficus is  effective in removing formaldehyde and xylene from the air.

Philodendron: There are over 200 different varieties of philodendron, all with different sized, colored, and shaped leaves. You’re sure to find one to fit your specific location. It’s effective in removing formaldehyde from the air.

Boston Fern: This wide spreading plant with beautiful arching fronds usually does best in hanging baskets. The fronds can be as long as 2-3 feet and 4-6 inches in width. Each frond has small leaflets (pinnae) on either side of a midrib, and the leaflets have slightly serrated edges. It’s effective in removing formaldehyde and xylene from the air.

Gerbera Daisy: This is an ornamental outdoor plant from the sunflower family. Gerbera Daisys can be kept in a pot indoors for short periods of time and then planted outdoors. It’s effective in removing formaldehyde, benzene, and trichloroethylene from the air.

Chrysanthemum: Mums, as they are often called, are a perennial flowering plant that can also be kept indoor for a short time and then planted outside.  It’s effective in removing formaldehyde, benzene, xylene, and trichloroethylene from the air.

These plants not only brighten our homes and offices, they also improve the quality  of the air we breathe. Care instructions and pictures of the clean plants listed above can be found in the Popular House Plant section of HousePlant411.com.