You can use Shatter or you can use individual pieces of the flower and animate them separately or you can wait for a few other folks to add their advice.
Explaining how to accomplish these effects with credibility is beyond the capacity of a post here on the Cow. you can easily research "blown away" or "text to sand" tutorials or just start scrolling down the huge list of AE tutorials till you find something that interests you.
Warning: Simulating natural phenomena like wind is much more difficult than you might imagine. AE tends to produce phony simulations if you use filters and effects without carefully studying thier application and often infinite adjustments.