Cactus is a unique plant. It stores a lot of water, enabling it to survive extreme temperatures. Almost all cacti are native to the hot and dry habitats of South and North America. There are nearly 2000 different kinds of cacti. The difference between cacti and other succulents is the existence of cacti, small cushion-like structures with trichomes (plant hairs), and thorns or thorny bristles (hook hairs) of almost all species. The areola is a modified branch from which flowers, more branches and leaves (if present) can grow. .