Native plants are plant species that have evolved over thousands of years to live in a certain area and climate zone. They are adapted to the average temperature, rainfall, and soil conditions of the geographical region. Once established, native plants are easier to maintain and require less watering, soil amendments, and other special treatment.
Native plants are more resistant to pests and diseases than exotic plants. Over many years, they have evolved to resist the insects and plant diseases that are indigenous to the area, and therefore don't require constant application of pesticides, fungicides, and other toxic chemicals to control pests.