Jade plants need full sun in order to grow properly and need to be drained well. Allow the soil to dry out completely before each watering. Softening leaves indicate it’s time for more water. cast iron plants can handle low light, extreme temperatures and can survive for a good length without water. However, It’s still a good idea to keep the soil moist for healthy growth by watering every 2-3 weeks.
Filtered light is best for this plant. Try using a curtain as a barrier between it and the sun, especially during the the spring and summer when the plant is producing new, tender leaves. - HouseBeautiful.com