How effective is the herbicide if it rains soon after being applied?

Depending on how much rain has fallen on the site, the effectiveness of the herbicide can be lessened if it rains within 2-3 hrs of the application.  If this is the case, the site would be reassessed in ten to fourteen days and may need to be redone.

There are Health Canada approved herbicides available that have 30 min to 1 hour rainfast.

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