The word "shit" has taken on negative connotations for mankind: repulsive, symbolizing the accumulation of troubles, representing undesirable outcomes. For Mother Nature, sh** is fertilizer.
The irony suggests that mankind struggles where perhaps we should relax, that nature thrives where we find weakness. One thing is certain: Nature will still be making flowers out of poo, long after mankind ceases to walk the earth.
Photo credit: Florian Möllers for Wild Wonders of Europe