Quote Originally Posted by Mr. Clandestine
You should find out approximately how long it takes before the plants begin to droop, and water then. Letting the plant wilt to determine when to water isn't a good method to use. This stresses the plant and can lead to stunted/delayed growth. These plants are hardy, so missing a watering isn't usually a death-sentence for the plant, but it's definitely not something you should do on a regular basis.
in order to do not death sentence them we should water while they are droppy?