These are the most popular and widely planted tree fern. This genera contains around 25 different species which can be found in many places throughout the southern hemisphere. This genera of plants is evergreen in mild climates, but if a frost occurs the tree loses all of it's leaves. Dicksonia can reach up to 50 feet in height in the wild, but in cultivation this height is often much less. Dicksonia Antarctica, a very popular tree fern for cultivation is not considered under threat yet, although it is estimated that 80,000-90,000 of these ferns are exported from Tasmania yearly.