Plants are more courageous than almost all human beings: an orange tree would rather die than produce lemons, whereas instead of dying the average person would rather be someone they are not.
"Arthur shook his head and sat down. He looked up. "I thought you must be dead ..." he said simply. "So did I for a while," said Ford, "and then I decided I was a lemon for a couple of weeks. I kept myself amused all that time jumping in and out of a gin and tonic."