Echinocactus platyacanthus

Echinocactus platyacanthus, also known as the giant barrel cactus, golden barrel cactus, giant viznaga, or biznaga de dulce, is a species of cactus (family Cactaceae). It is native to central Mexico in the Chihuahuan Desert. This species is the largest of the barrel cacti. In Mexico the hairs are often used for weaving; a traditional candy is produced by boiling the pith.
Description.
This slow-growing species can reach sizes up to tall and wide and can live over a hundred years. Photographs exist of specimens almost four feet (almost 1.2 m) in thickness. What is probably the largest individual living today is the one called "Goliat" at the "Area Natural de Daxpe" in the Municipio de Cadereyta, Querétaro State, Mexico, which is 9' 8" (2.95 meters) in height, at least three feet (0.9 meter) thick and weighs about three metric tons (6,600 pounds). Their stems are a gray-ish blue color and the straight, rigid spines are black. The apex of the cactus is flat and covered with a yellow felt-like substance. They're heavily ribbed and have large areoles. Their diurnal, tubular flowers bloom at the end of spring to summer and are a vivid yellow color; they grow to about in height and in width. The fruit is about long and is covered by a hairy wool.