The plant is one of the essential life forms on Earth for environmental sustainability and groundwater purification. Biotic and abiotic components of environment are relatively connected with each others. Plants of all sizes and shapes were present in both aquatic and terrestrial ecosystems. Some examples include trees, mosses, ferns, vines, grasses, shrubs, herbs, flowering plants, and green algae. The plants contribute significantly to the environment and ecological equilibrium. They are essential elements to our environment and maintain ecological balance. Plants and animals have habitats in terrestrial and aquatic ecosystems, such as the ocean, reservoirs, forests, grasslands, mountains, and deserts. Additionally, plants supply living things with the three fundamental necessities of food, clothing, and shelter. In addition to providing us with food and clean air daily, plants play a crucial role in maintaining a healthy ecology. As a result, trees are the primary food source for all living things. In addition, they provide us with oxygen, medicines, fuel, wood, recreation, industrial goods, preservatives, pesticides, and other supplies. Plants make our environment better by eliminating air pollution and groundwater recharged. This chapter focuses on the role of plants in a sustainable environment and water quality.