Zackery from Fairburn writes
When do I need to stop using it?
The best time to use Celsius WG Herbicide or any other herbicide will depend on where you are treating and the specific type(s) of weeds you need to treat. Most post-emergent herbicides will be most effective when the target weeds are young actively growing. If you need help with identification or determining the best time to apply, you can call your local cooperative extension office and ask to speak to the master gardener on staff and he/she should be able to help you.
Answer last updated on: 06/08/2016