Picture of circular planting pool

Quick answer：

A circular planting pool is a garden feature designed for growing plants in a circular shape. It is often used in gardens, parks, or as a centerpiece in small spaces. These pools can be made of various materials such as concrete, plastic, or stone, and can be decorative as well as functional. They are suitable for a range of plants including flowers, herbs, and small trees. The design of a circular planting pool can vary from simple to elaborate, with different levels, edges, or water features.