Christina Georgina Rossetti - A Toadstool Comes Up In A Night

A toadstool comes up in a night, -
Learn the lesson, little folk: -
An oak grows on a hundred years,
But then it is an oak.

Christina Georgina Rossetti

http://www.poemhunter.com/poem/a-toadstool-comes-up-in-a-night/