With the seeds really flying right now coupled with all the moisture in the ground and the appearance of sun with warm days and presto……LOTS of germination.  Not only should you have applied a pre-emeregent in your lawn, but all your mulched beds should be getting a good coating of Preen.  I even Preen river rock beds.  It does work!

Be sure to get the one specifically for gardesn if you shoose to use a pre-emergent in there!