Persian silk tree's root system is relatively shallow, typically extending around 1 to 2 feet deep into the soil. This suggests that a regular watering method would be suitable for this plant, ensuring that the moisture reaches the upper layers of soil where the roots are concentrated. The frequency of watering depends on several factors such as pot size, root depth, and plant size. For a mature persian silk tree plant in a medium-sized pot, an average watering volume might be around 1 to 2 liters every 7 to 10 days.