Adenium socotranum is endemic to the island of Socotra (Soqotra). It is by far the largest species, reaching a height of 15 feet (4.6 m) with a cylindrical trunk up to 8 feet (2.5 m) in diameter at the base. It differs from all other species (except the Oman form of A. arabicum) in its very short growing season. Plants rarely leaf out before mid summer, and produce stem growth for only a few weeks. The pink flowers appear for a few weeks in spring while the plant is leafless. Its remote location, great size, and until recently unavailability in the trade has made it the holy grail of adeniums. However, it is overrated by collectors, because it is very slow growing and a seedling will take many decades to achieve impressive size in cultivation.