Does the Chinese tree peony require a lot of watering?

No, it does not need much water. When the annual rainfall is above 24 inches, watering is usually not necessary. Because the roots are usually 3 to 5 feet deep into the ground. However, for the first growing season when the roots have not yet fully developed, it must be watered, if there is a long period without rain. Water slowly and gently. Too much moisture is detrimental to the plant.