There are many types of cacti, but the signature style is of a tall, thin green plant covered in spikes. Cacti are often used in video games as features in hot and dry environments such as deserts, though can also be used as ornamental plants. Cacti can range in size, the largest in real life reaching up to 19.2 meters. They are well known for their ability to conserve water in arid conditions. Cacti are covered in spines, which is why in some video games they will harm the player when touched.