Henna plants are indigenous to desert locations around the world. They can live without water for a very long time just as they would in the desert with monsoon cycles.
Growing henna at home requires that the plant be kept in a sunny spot where the temperature will not drop below 50 degrees Fahrenheit. When you first pot the plant, you should saturate it in water and then only do so occasionally when the soil becomes dry. Just as the desert has drought periods, a henna plant is able to live without being watered everyday. Henna plants can also be temperamental meaning that they will drop all their leaves at once for no reason at all. Sometimes they will do this because they are in too cold of conditions or a fungus attacks the plant, but sometimes the henna plant will just do it for no reason. These plants are easy to grow and manage in a household where sun is plentiful and watering occurs occasionally.