- Dragon Tree (Dracaena marginata)
Dracaena is a genus of about 120 species of trees and succulent shrubs.
The majority of the species are native to Africa, with a few in southern Asia through to northern Australia with one species in tropical Central America.
The thin leaves are linear and a deep, glossy green color with red edges; typically 30–90 cm long and 2–7 cm broad, tapering to an acuminate point.
It is a popular houseplant that needs little attention, with several cultivars available with the leaves variegated with red or pale yellow. It requires a minimum temperature of 15 °C (59 °F), and is more tolerant than most plants of dry soil and irregular watering, though liable to root decay in permanently wet soil.
Because it requires minimal care it is very popular in offices where the constant heat and light suits its growing requirements.
It has been widely confused with other species of Dracaena, and many or most of the plants in cultivation under this name may actually be D. cincta or D. concinna.
It is one of the plants used in the NASA Clean Air Study and has shown to help remove formaldehyde. It is an effective air cleaner and is said to be among the best plants for removing xylene and trichloroethylene.