Alocasia Bisma Alocasia Bisma is a beautiful unique variety of Alocasia. These beautiful Alocasias have leathery blue-grey foliage with a deep purple underside. How to care for your Alocasia – Water: Alocasia need their soil to be lightly moist at all times, do not allow to dry out. Light: They enjoy bright but indirect sunlight, direct sun can scorch the leaves. Humidity: They love warmth and humidity, a bathroom or kitchen would be a perfect spot. Temperature: They prefer warm temperatures about 20 degrees C. Toxic to cats & dogs? Yes Air purifying? No