|A variegated cultivar of Sansevieria trifasciata|
It is an evergreen perennial plant forming dense stands, spreading by way of its creeping rhizome, which is sometimes above ground, sometimes underground. Its stiff leaves grow vertically from a basal rosette. Mature leaves are dark green with light gray-green cross-banding and usually range between 70–90 centimetres (28–35 in) long and 5–6 centimetres (2.0–2.4 in) wide.
It is commonly called the snake plant (not to be confused with the very similarly named Nassauvia serpens), because of the shape of its leaves, or mother-in-law's tongue because of their sharpness. In China, it is known as hǔwěilán (虎尾兰, tiger's tail orchid). In Japan, it is called tiger's tail,(とらのお）'. In Brazil it is commonly known as espada de São Jorge (sword of Saint George). In Turkey it is known as Paşa Kılıcı (pasha sword). In Nigeria it is commonly linked with Ogoun, the Orisha of war, and is used in rituals to remove the evil eye. A yellow-tipped variant is associated with Oya, the female orisha of storms. In Africa, the plant is used as a protective charm against evil or bewitchment.
Cultivation and uses 
It is now used predominantly as an ornamental plant, outdoors in warmer climates, and indoors as a houseplant in cooler climates. It is popular as a houseplant as it is tolerant of low light levels and irregular watering; during winter it needs only one watering every couple of months. It will rot easily if overwatered. A study by NASA found that it is one of the best plants for improving indoor air quality by passively absorbing toxins such as nitrogen oxides and formaldehyde.
Numerous cultivars have been selected, many of them for variegated foliage with yellow or silvery-white stripes on the leaf margins. Popular cultivars include 'Compacta', 'Goldiana', 'Hahnii', 'Laurentii', 'Silbersee', and 'Silver Hahnii'. 'Hahnii' was discovered in 1939 by William W. Smith, Jr. in the Crescent Nursery Company, New Orleans, Louisiana. The 1941 patent was assigned to Sylvan Frank Hahn, Pittsburgh, Pennsylvania.
S. trifasciata is considered by some authorities as a potential weed in Australia, although widely used as an ornamental, in both the tropics outdoors in both pots and garden beds and as an indoor plant in temperate areas.
- "Sansevieria trifasciata". World Checklist of Selected Plant Families. Royal Botanic Gardens, Kew. Retrieved 2012-12-31.
- Harrison, Lorraine (2012). RHS Latin for gardeners. United Kingdom: Mitchell Beazley. p. 224. ISBN 9781845337315.
- "Mother-in-Law's Tongue or Snake Plant". Retrieved 2010-03-04.
- "Interior Landscape Plants for Indoor Air Pollution Abatement NASA". Retrieved 2011-02-01.
- Smith, William Walter. "Sansevieria". Plant Patent 470. United States Patent Office. Retrieved March 26, 2013.
- "Sansevieria trifasciata var. laurentii (v) AGM". Royal Horticultural Society. Retrieved March 26, 2013.
- "Sansevieria trifasciata 'Bantel's Sensation' AGM". Royal Horticultural Society. Retrieved March 26, 2013.
- S. Csurhes and R. Edwards (1998). "Potential environmental weeds in Australia: Candidate species for preventative control". Queensland Department of Natural Resources. Archived from the original on October 10, 2007. Retrieved March 26, 2013.
- Germplasm Resources Information Network: Sansevieria trifasciata
- Kamal Meattle: How to grow fresh air at TED
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