My kitty Deidre (since passed) was the one who liked to use potted plants as a litterbox. She's the reason I made my biggest dragon tree cat-proofed with knicknacks and Happy Meal toys half-buried in the dirt (half-buried so they couldn't be knocked out or pushed over). Yuan used to try and eat the dragon trees (not good for cats) until I figured out that as long as I have cat grass on offer, he leaves the dragon trees alone. Maggie has never messed with the plants.
Dudley the Dragon Tree with his colorful protection
Yes, there's always one. Grass is a must for indoor cats