Indoor succulent growers should water their plants 14-21 days early on, and adjust the timing as they grow. The climate where you live will also affect how much watering is required. Euphorbia Ingens require very little watering because most succulents can store water. A sign to increase your watering frequency is when your succulent starts to lose its leaves, or turning brown. At least one pair of leaves and at most one stem should be present. Your cutting should be watered at least once a week.