Cereus Paolina Cactus PlantCereus paolina, also known as Cereus forbesii var. paolina or the Hedgehog Cactus, is a unique and fascinating species of cactus. Here's a detailed description of the Cereus paolina cactus: Appearance: The Cereus paolina cactus is a columnar or cylindrical shaped cactus with multiple stems that grow upright. It can reach a height of up to 2 to 3 meters (6 to 10 feet) in its natural habitat, but its size is typically smaller when cultivated indoors.