Why pre-emergent is the best way to prevent weeds

The snow is gone and now is the time to start thinking about the most important step in keeping your lawn free of weeds: the pre-emergent application.┬áPre-emergent is a product that prevents weeds from starting, mainly crabgrass, spurge and oxalis. But why so early? Along the Wasatch Front crabgrass germinates from mid-April to late May,…