How Pre Emergent Works In The Lawn 

Pre-emergent herbicides work by inhibiting the germination and growth of weed seeds in the soil. These herbicides are applied to the soil before weed seeds have a chance to sprout and establish themselves as mature plants. 

Here's how pre-emergent herbicides work: 

1. Barrier Formation:When a pre-emergent herbicide is applied to the soil, it forms a chemical barrier in the top layer. This barrier prevents weed seeds from sending down roots and emerging from the soil.
2. Germination Inhibition:Pre-emergent herbicides work by inhibiting the growth of the tiny roots (radicles) and shoots (plumules) that develop from weed seeds as they try to germinate. This prevents the seeds from establishing themselves as mature plants.
3. Selective Action:Pre-emergent herbicides are typically selective, meaning they primarily target weed seeds while allowing established grass and desirable plants to grow unhindered. This selectivity is achieved by targeting specific biological processes unique to germinating weeds.
4. Uniform Distribution:Proper application involves ensuring the herbicide is evenly distributed over the target area to create a consistent barrier that can inhibit weed germination uniformly.