My Daddy Has a Green Thumb

Life is full of questions for young boys and girls. And here is the adorable tale of a little boy who grows quite curious when he hears others repeatedly say that his daddy has a green thumb. The little boy looks again and again at daddy's thumb - but cannot see even the slightest bit of green. What does everybody mean with all this talk about being green?
The little boy sets out on his own detective mission to uncover what it is that everybody else can see that he somehow cannot - and soon discovers that sometimes, words don't always mean exactly what we think they mean. It becomes a grand mystery that he is determined to get to the bottom of.
Will he ever be able to discover the actual secret behind the curious case of daddy's green thumb? Where exactly is the answer hidden?