Aruba has a semi-arid climate with lots of heat, little rain and consistent trade winds that rapidly evaporate moisture. So the predominate flora is cactus, especially along the north where few people live and only the adventurous tourist visits. Three species are most common. The tallest of the columnar or candle cacti is the kadushi. Its branches can reach 20 feet. Historically it was used for medicinal purposes and for making shampoo.