Loopy is always focusing on what he hasn't done rather then what he has, and he becomes very frustrated. So, his friend Curly teaches him about how petunias grow - in lots of different, imperfect directions that we can't control! Loopy learns that by trying to control whether he makes mistakes or not it's as if he's always trying to grow 'perfect' petunias. Sometimes he just needs to accept that things go a certain way and to change his definition of 'perfect' to mean trying his absolute best.