How do you treat frostbite on an evergreen shrub?

To treat frostbite on an evergreen shrub, first assess the damage by checking for discolored or wilted leaves and branches. Prune away any severely damaged or dead parts to encourage new growth and improve air circulation. Ensure the shrub is adequately watered, as healthy hydration can help it recover. Additionally, consider applying mulch around the base to protect the roots from further temperature fluctuations.