In metric terms a square foot is a square with sides 0.3048 metres in length. One square foot is the equivalent to 0.09290304 square metres. The six floors of the White House (Washington D.C., U.S.A.) have a combined floor-space area of approximately 55,000 square feet.
A cactus (plural: cacti, cactuses, or cactus) is a member of the plant family Cactaceae within the order Caryophyllales.The word cactus derives, through Latin, from the Ancient Greek ÎºÎ¬ÎºÏÎ¿Ï, kaktos, a name originally used by Theophrastus for a spiny plant whose identity is not certain.Cacti occur in a wide range of shapes and sizes. Most cacti live in habitats subject to at least some drought.actus stems are often ribbed or fluted, which allows them to expand and contract easily for quick water absorption after rain, followed by long drought periods. Like other succulent plants, most cacti employ a special mechanism called  crassulacean acid metabolism  (CAM) as part of photosynthesis.
In springtime, you can take your Christmas cactus outside in its pot as long as day and nighttime temperatures stay above 50 degrees Fahrenheit.But unlike desert cactuses, the Christmas cactus wonât tolerate the intense full summer sun.he Christmas cactus (Schlumbergera bridgesii) is a native of Brazil but is grown widely as a winter-flowering houseplant. In nature, it grows as an epiphyte in shady tropical rain forests.