That said, the right watering frequency that most indoor succulent growers adopt is watering 14 - 21 days at the early stage and adjusting the timeline as time goes on. Your climate will play a major role in how you water your plants. Euphorbia Ingens require very little watering because most succulents can store water. Your watering frequency should be increased if your succulent begins to shed its leaves or turns a brownish color. Make sure that at least a few pairs of leaves and a stem are present. Your cutting should be watered at least once a week.