Steve from Or writes
Why is this not working?
Crossbow Herbcide is a post-emergent herbcide and will only kill the weeds that are actively growing at the time of application. If there are weeds under the soil that have not germinated yet, those weeds will not be affected by Crossbow. To treat weeds that are in the soil that have not germinated, you would need to use a pre-emergent in the spring/late fall before the soil temps reach 55 degrees. Another option is to continue to treat with Crossbow as the weeds emerge.
Answer last updated on: 09/22/2016