Sure, Oscars love to break down fences to get to your plants!
I remember when i still had plants, i placed a lot of heavy stones on top of the roots. I figured none of my fish was big enough to move them.
Came home later, plants uprooted, stones moved. :angry:
Turned out they teamed up to get to the roots.
The 3 biggest fish would work at one side of the stones together and still thrashed my plants.
Last time i bought a "very hard leaved motherplant, that my fish would never eat".
Or that's what the LFS told me.
One day later the plant was torn to pieces and that was the last of my planted tank.
No more live plants for me.