Preemergence Herbicide Timing<BR>Soil temperatures can vary in a neighborhood - south facing slopes warm earlier in the Spring <BR>Coarse textured soils warm more quickly than fine-textured soils <BR>Most preemergence herbicides are degraded by soil microorganisms - activity is less at 45 degree vs. 70 degree soil temp. Most warm-season grassy weeds germinate at 55 to 65 F.  APPLY EARLY <BR>Can the site be irrigated for activation?<BR>