Punctuation.  Matters.
Grow.  Dammit.<br /><br />I’m fine with the colloquial misspelling of damn it.  That’s even part of the charm, but punctuation sends a message and tells the reader how to read the text.  It should read “Grow, Dammit!”  Grow.  Dammit.  as written forces you to pause after [Grow.] complete thought.  Dammit.  indicates another “full stop” complete thought but lacks the emphasis of an exclamation point.  If you are addressing the plant in question, “Grow, dammit!” makes more sense as it addresses the unnamed subject of the exclamatory sentence.<br /><br />Still for those less grammatically inclined it is a cute sign and does capture the intended sentiment of the frustrated gardener.  However, prepare to watch your English major friends twitch when showing off your botanical struggles.
Rating: 3 stars