Sansevieria trifasciata, also called viper's bowstring hemp,[2] snake plant, mother-in-law's tongue or Saint George's sword (in Brazil) is a species of flowering plant in the family Asparagaceae, native to tropical West Africa from Nigeria east to the Congo.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. The specific epithet trifasciata means "three bundles".
 
 
Cultivation and uses:
Like some other members of its genus, S. trifasciata yields bowstring hemp, a strong plant fiber once used to make bowstrings.
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 because 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.[4] 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.
The variety S. trifasciata var. laurentii and the cultivar 'Bantel's Sensation' have both gained the Royal Horticultural Society's Award of Garden Merit.
It can be propagated by cuttings or by dividing the rhizome. The first method has the disadvantage that the variegation will be lost.
Sansevieria trifasciata at the Garfield Park Conservatory, Chicago
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.
 
 
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