Can You Put Grass Seed Down with Pre Emergent

In a word, no. Because newly seeded lawns are still germinating, the pre-emergent can affect germination in the process. More mature lawns are sturdier against the herbicide, so it’s best to wait at least 4 months after planting the lawn to apply the pre-emergent.

How long after applying pre-emergent Can I plant grass seed?

Once some pre-emergents are applied, you only have to wait seven to 10 days before reseeding. The same is true of laying sod after pre-emergent. Rake over any bare spots and turn over the dirt.

Does pre-emergent kill grass seeds?

Pre-emergent herbicides don’t actually kill weed seeds before germination. Instead, they fatally interrupt their growth process in some way to prevent the seed from getting all the way through the seed germination stage. For that to work, it has to be in the soil at the right time — at the right temperature.