How do you trap the most powerful being in the world?
In the classic story Whatever Happened To The Man Of Tomorrow, writer Alan Moore has Superman attacked by an alien parasite which attaches to him and puts him a coma, trapped by a dream.
In the dream, Superman is back in his home world Krypton, living a happy life in a world which has not exploded ever (unlike reality, which is why he is exiled here on Earth).
But very gradually, irregularities start kreeping in, and the dream becomes less and less happy. This eventually leads to Superman being able to wake up, freeing himself.
I was thinking: why does the plant not simply make the dream perfect, so he would want to stay there?
Simple: it’s not the plant making the dream after all, it’s Superman’s mind. And he wants to wake up. So he makes the dream unpleasant enough that he *wants* to wake up.
I thought that this explains a lot.