Is There a Survival of the Fittest Among Plants of the Same Type?

Leshanko preached that there was no such thing as survival of the fittest among plants. Instead they would all cooperate for the common good like people, he said. He's a kind of scientist where if you could give him a truth serum he would probably be like yeah I did this and this and this. And I did it because the underlying point I'm making is true. It would be hard not to look at the Nazis and what they're doing using Mendelian genetics as sort of a justification for a lot of it.