Crassula Perforata ‘String of Buttons’ can be grown both indoors and outdoors. If kept indoors, provide as much light as possible. Typically speaking, they need approximately 4-6 hours of light per day to thrive. Crassula Perforata needs a well draining soil. Watering largely depends on the climate you live in. Although these plants are highly adapted to dry weather conditions, they do much better when given sufficient amounts of water. There really isn’t a set schedule or formula on when to water succulents. One good way to tell whether it’s time to water is to check the moisture of the soil. The top inch of the soil needs to feel dry before you can water again.