No such thing as a plant going to keep a snake away. You need to make sure your property is tidy as possible, no piles of sticks/limbs/debris, etc. Keep everything clean and organized. If you live out in the woods, snakes are part of the territory....it is what it is. You could however introduce a couple king snakes....they eat the heck out of other snakes. A lot of folks do this to help curb the poisonous snake population.

You can go to Lowe's or Home Depot and buy the white powder snake repellent to sprinkle around the edge of your property. I don't know how well this product works so you may want to inquire with some knowledgeable folks on here.

Try scattering moth balls and cedar chips in problematic areas.

My mother planted gourds, said snakes didn’t like the vines?

Geese, I’ve heard keeps snakes away.

we caught snakes in a fabric we put over daylilies to deer from eating the daylilies. Snakes would get caught trying to go through the fabric, cotton mouths.