Roundup & Grass: When to Water After Application (Expert Advice)

It is not recommended to water after applying Roundup on grass. Roundup is a non-selective herbicide, meaning it will kill any plant it comes into contact with. Watering after application will only help to spread the herbicide and cause more damage to your grass.

The best time to apply Roundup is on a warm, sunny day when there is no rain in the forecast. This will allow the herbicide to dry completely and be absorbed by the plants before it is washed away by rain.

If you must water after applying Roundup, wait at least 24 hours to allow the herbicide to take effect.