When addressing the issue of weed control, we attack the problem in two ways:
Pre-emergent weed control targets the weed seeds currently in your soil and sterilizes them, preventing them from germinating and becoming mature plants. Pre-emergent weed control products are typically applied in the Spring.
Post-emergent weed control is the process of eradicating mature weed plants. Post-emergent weed control products can be applied to lawns just about any time weeds present themselves.