Kath writes
I am planning to top dress the lawn and then re-seed it.
You could potentially apply a light top dressing on your lawn after using a pre-emergent such as Prodiamine 65 WDG. Be sure that the pre-emergent is activated with at least 1/4 inch of irrigation or rainfall in accordance with the product label instructions.
A concern with your question is that you mention you will be reseeding your lawn, in which case you cannot apply the Prodiamine (or most other pre-emergents) before you seed the lawn. The Prodiamine will prevent your new seed from germinating. So you would either need to seed first and then wait until the new lawn is established (mowed at least twice) before you apply Prodiamine, or you need to wait several months after applying the Prodiamine before you put down new seed.
Answer last updated on: 01/24/2021
