Do I need to use fertilizer with planting?

No, native plants normally do not need fertilizer because they have adapted to the local soil and climate conditions of the specific geographic regions that they were found in. Adding fertilizer can potentially harm native plants, and promote the growth of other invasive weeds or vegetation. It is important to choose plants that are native to your area or well-suited to your existing soil type and conditions because they have evolved over thousands of years to those specific ecosystems that they naturally thrive in.