Don from Orange, Calif writes
Hi Yield Weed & Grass Stopper with Dimension is labeled for pre emergent control of many common weeds including poa annua (annual bluegrass). For best results, it is recommended to apply pre emergents in late fall and early spring. Fall applications should be applied when soil temperatures are below 70 degrees but before the first frost of the season. Spring applications should be applied as the weather warms but before soil temperatures reach 55 degrees. View our Warm Season Lawn Care Calendar or contact your County Cooperative Extension Office for specific timing recomendations in your area. Please view our Poa Annua Treatment & Prevention Guide for more information.
Answer last updated on: 08/18/2021
