Pincushion cactus is also characterized by white spines all over it and it’s an easy to grow plant with minimal care. The Pincushion cacti are small, sturdy plants that usually grow small in size. The pincushion cactus plant is most commonly grown indoors. These plants produce a purplish red flower that grows in between the spines giving a message to glow and flourish even in adversity. They give beautiful look in small pots.