It might be surprising to learn from CGRosselli that flowers preach. However, if we come to think about it, flowers can indeed tell us many things if just care to listen.
For example, what makes flowers bloom? It's usually the right combination of temperature and moisture that will trigger the flowers to bloom. There will be different rates of growth on different parts of a flower such that we will see the edges of a petal curling and then opening up.
The photo shows flowers of the fire tree or Caesalpinia pulcherrima.