Therapeutic Gardening
The simple reason is that we are living beings in nature, and our bodies are designed to live in harmony with it. Major elements that influence the human body include the sun, moon, and earth. For example, the day-night cycle is related to the rising and setting of the sun. When the sun rises, we wake up, prepare food, and go to work in the fields or gardens. As evening approaches, we rest, have dinner, chat a little, and then go to bed.

Microorganisms that live both on our skin and inside our bodies play a role in maintaining balance, keeping us from getting sick easily.
When children are distanced from nature and lack access to natural microorganisms, they may develop allergies or other chronic illnesses as they grow up. Some may catch colds easily, indicating a weakened immune system. Furthermore, if they spend all their time indoors and don't exercise or engage in outdoor activities, their health will weaken even more.

Spending time with soil and sand, planting trees and plants, or gardening provides the body with additional microorganisms, which is beneficial because it increases the diversity of microbes. The result is a better immune system and less susceptibility to illness.
Currently, there are global research studies that indicate the benefits of gardening for physical and mental health. Gardening helps exercise the brain, regenerate cells from memory loss, and engages large muscle groups in almost every part of the body.