Why do I feel empathy for plants?

Nothing's wrong with you. You just have compassion for living organisms other than humans. Many humans don't think about how plants are alive, so have no feelings towards them. I'm Buddhist, so I've learned to appreciate all living things, whether it'd be a plant, animal, or human. I'll admit I pick flowers, etc, but I tend to pray for it, or I put them to good use like brightening up someone's day, etc. It's normal. :]