|A variegated cultivar, 'Laurentii'|
|Wild plant with fruits|
Dracaena trifasciata is a species of flowering plant in the family Asparagaceae, native to tropical West Africa from Nigeria east to the Congo. It is most commonly known as the snake plant, Saint George's sword, mother-in-law's tongue, and viper's bowstring hemp, among other names. Until 2017, it was known under the synonym 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 from 70–90 centimetres (28–35 in) long and 5–6 centimetres (2.0–2.4 in) wide, though it can reach heights above 2 m (6 ft) in optimal conditions.
The plant exchanges oxygen and carbon dioxide using the crassulacean acid metabolism process, which allows them to withstand drought. The microscopic pores on the plant's leaves, called the stomata and used to exchange gases, are only opened at night to prevent water from escaping via evaporation in the hot sun. As a result, stored oxygen is released at the opening of the stomata at night, unlike most plants which continuously exchange gases during the day.
It is a weed in some parts of northern Australia.
Dracaena trifasciata is commonly called "mother-in-law's tongue", "Saint George's sword" or "snake plant", because of the shape and sharp margins of its leaves. It is also known as the "viper's bowstring hemp", because it is one of the sources for plant fibers used to make bowstrings.
It is known as hǔwěilán (虎尾兰 or 虎尾蘭, "tiger's tail orchid") in China; lengua de vaca (cow’s tongue) in Puerto Rico; tora no o (とらのお, "tiger's tail") in Japan; and paşa kılıcı ("pasha's sword") in Turkey. In Portugal and Brazil, it is known as espada de São Jorge ("sword of Saint George"). In the Netherlands and Flanders (Belgium), the plant is also known as "vrouwentong" (women's tongue). In Russia it is known as "тёщин язык" ("mother-in-law's tongue") and "щучий хвост" ("pike's tail").
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 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. It is commonly recommended to beginners interested in cultivating houseplants for its easy care.
The NASA Clean Air Study found D. trifasciata has potential to filter indoor air, removing 4 of the 5 main toxins involved in the effects of sick building syndrome. However, its rate of filtration is too slow for practical indoor use.
D. 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.
Varieties and cultivars
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.
In its native range in Africa, a yellow-tipped cultivar is associated with Oya, the female Orisha of storms. In Nigeria it is commonly linked with Ogun, the Orisha of war, and is used in rituals to remove the evil eye. In Brazil its common name Espada de São Jorge links it to Saint George, who by syncretism is also associated with Orisha Ogun.
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