Henry from Klamath Falls writes,
How long does Hyvar X-L Herbicide last and how long does it take to work?
Hyvar X-L Herbicide will typically last for at least a year. Moisture is required for activation. Best results are obtained when the soil is moist at the time of application and irrigation occurs following application. Since moisture is required, signs of control may be slow to appear and may not become apparent until moisture carries the herbicide into the root zone of targeted weeds. If you need further help with Hyvar X-L Herbicide we recommend you contact DuPont since it is a new product for us.
Answer last updated on: 05/10/2015