You probably noticed those little yellow flowers that are popping up everywhere, from highway medians to your front yard.  
 
Those dandelions are spreading like crazy, thanks to our late spring and warm weather.  In some places, there are almost too many of them to pull out.  
If you want to get rid of them and keep them from coming back, make sure and treat your yard with a pre-emergent twice a year, in the spring and fall.