Somewhere on the net I read a post by a woman who changed her life for the better.
She said and I quote:
From the ashes grew a rose of a self, dedicated to a new life.
I thought: If you want to improve your life, that's okay with me. And it's a nice metaphor, if a little too cliche for me.
But...but do roses grow all that well in ashes?
So I surfed the net, especially for sites about growing roses. One rose grower said he would use ashes on roses only once or twice a season because it would interfere with the PH of the soil. He also said he would do it only if the ground was too acidic.
Therefore..adequate metaphor, if cliched, but bad botany.