This will depend on what weeds you are trying to control, and what the product label said to do regarding how long each application is expected to last. For some, it's several months, and in that case, another application would not be needed or recommended. Can you provide more information about what exactly was applied (full product name) and what weeds you are trying to suppress? Are they growing in lawn, garden beds, or both? If you don't know the weed names, feel free to send photos of their foliage and growth habits. You can also explore our online weeds content to find matches for common species.

Miri