Anthedesia appears to be a form of Anthurium, and these should not be allowed to dry out, so water every other day or daily, depending on how dry the plant gets, but do not allow it stand in water in a tray or outer pot - empty the container 30 minutes after watering. Keep the air around the plant moist, (I keep a small pot of water behind mine, topped up all the time as it evaporates, to increase humidity around the leaves of the plant) place in a spot with bright light, but not direct sunlight, although some winter sun is fine. Feed regularly while the plant is actively growing.