Pre-Emergent – Effective After Rain?

Q: I put down pre-emergent last week before a horrific amount of rain fell. Do I need to redo it?

A: I think you’re fine unless there is a lot of slope to your lot. If soil washed down, it could carry the pre-emergent granules with it. If no soil washed away, the chemical just dissolved into the earth and will work as promised.

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