They have evolved over thousands of years to local conditions such as soil type, rainfall and temperature. Not all plants that exist in the wilderness are necessarily native. Species such as Purple loostrife, Queen Anne's lace and Garlic mustard have been introduced from other parts of the world. In some cases, these plants have been naturalized. That is, they have been introduced to an area and having spread, now grow in the wild without human cultivation.
Biodiversity is the variety of all life on earth.
Biodiversity is a good indicator of ecosystem health. Inform them about the idea of school ground naturalization - explain the learning opportunities for the students and that the process and final product of naturalization will be used for instructional purposes. Apply for grants to support your project from a variety of sources. Refer to the funders list provided in the online Library. Sometimes your PTA will be willing to contribute some funds.