“Weeds are popping up everywhere, and I’m frustrated because I sprayed my lawn last fall! Why are they coming back?”
Weeds present themselves in 2 main yearly cycles: winter annuals and spring annuals, meaning that certain weeds will pop up during the fall/winter and then die, while other weeds will pop up during the spring/summer and then die.
Herbicides that kill weeds before they grow are called “pre-emergent herbicides”, just as “post-emergent herbicides” will kill off weeds that have already grown.
If you treated your lawn last fall with one or both of these treatments, it’s still likely that weeds will grow in the spring, once the winter weeds die away.
The solution is simple: around February or so, apply a pre-emergent herbicide to stave off weeds before they grow. Any weeds that slip through the net must then be followed up with a post-emergent treatment.
Don’t fret over these issues if you recognize them in your own backyard. The great thing about a lawn is that it grows and grows, and usually is able to be fixed one way or the other. Do your best, and call for quality assistance if you need it.