Pampas Grass and Snakes
How do you keep snakes from living in Pampas Grass? What is the best way to kill Pampas Grass?
This article has some answers for you: https://www.gardeningknowhow.com/ornamental/foliage/pampas-grass/pampas-grass-removal.htm
Regarding snakes, the vast majority of snakes are harmless to people, and extremely beneficial for your garden, but this article will help with discouraging snakes,if you really want to do that: https://www.gardeningknowhow.com/plant-problems/pests/animals/getting-rid-of-snakes.htm