What term describes an area of land improved by vegetation such as grass and trees?

The term that best describes an area of land improved by vegetation such as grass and trees is naturalized. A naturalized area refers to land that has been enhanced or altered by the introduction and support of natural vegetation which can include grasses, trees, and various forms of plant life that create ecological benefits, promote biodiversity, and improve aesthetics.

Landscaped generally refers to areas that have been modified and often manicured for recreational or ornamental purposes, typically emphasizing design and organization rather than just the presence of vegetation. Urbanized pertains to land that has been transformed for urban development, emphasizing built environments like cities and towns, often with minimal vegetation. Developed is a broader term that encompasses any area improved for human use, which can include agricultural, industrial, and residential development, and does not specifically focus on the presence of vegetation.

Thus, naturalized is the term that most accurately captures the essence of land enhanced by the growth of vegetation, emphasizing the natural aspect of the improvement.