Ron from Oakdale, Ca writes
When are the optimum times to apply this product to Fescue blend lawns in San Joaquin Valley of California? Thank you!
Preemergents such as Hi-Yield Weed and Grass Stopper with Dimension Herbicide are applied in the fall and/or spring. We suggest contacting your county extension office for specific timing in your area.
The general rule for spring is to apply your pre-emergent herbicide treatment after the ground has thawed from the winter but before the temperature of your soil reaches 55 degrees, as that is when crabgrass begins to germinate. Other weeds will germinate when the soil temperature is between 55 and 65 degrees. You can use a soil thermometer to determine the temperature of your lawn/area. You will want to measure the temperature of the soil a few inches below ground.
The ideal time to apply a fall pre-emergent herbicide to your yard is between August and November when the soil temperature is below 70 degrees and dropping.
Answer last updated on: 09/22/2021
