Nothing like a threatening German poem to keep away prospective rose thieves:
“Wer Rosen stielt, der wird verbrannt
und wird an’s Teufels Galgen g’hangt.”
Saw this down near the Bodensee (Lake Constance) at the beginning of this year. Translated: Whoever steals roses will be burned and hung on the Devil’s gallows. Good thing for the scary message, because the Gartenzwerg looks pretty friendly himself.
Reminds me a little bit of Struwwelpeter.