Traditionally, the walls are made of "yotojoro" – a wattle and daub of mud, hay and dried canes, but some Wayuu now use more modern construction with cement and other materials. The preferred material for roofing and "yotojoro" wood is the dagger cactus ("Stenocereus griseus"), which the Wayuu call "yosú". The word "yotojoro" originally referred to the cane-like inner wood of the "yosú" cactus. This plant is used for many other purposes: it is planted to create living fences around pastures; young shoots are fed to goats; the fruit ("iguaraya") is similar to pitahaya and is a popular food among the Wayuu. Because the demand for "yosú" as food and wood is seasonal, at times there is little fruit, building material or even cuttings for fences. It has thus been proposed to develop techniques for the Wayuu to cultivate it. Due to varying supply of "yosú" wood for construction, other plants are also used, including "trupillo" or "turpío" ("Prosopis juliflora"), "jattá" ("Haematoxylum brasiletto"), "kapchip" ("Capparis zeylanica") and "kayush" (Peruvian Apple Cactus, "Cereus repandus").