Post Emergent Weed Killer

Post-emergent weed killers are used after weeds have already appeared. This collection includes professional-grade products for controlling broadleaf weeds, grassy weeds, sedges and unwanted vegetation in lawns and other labeled areas.

Post-Emergent vs. Pre-Emergent Weed Control

A post-emergent weed killer controls weeds that are already growing. It is applied directly to visible weeds and absorbed through the leaves, roots or both, depending on the product.

A pre-emergent weed killer is applied before weeds emerge. It creates a barrier in the soil that helps prevent certain weed seeds from developing. Pre-emergents are best used before seasonal weeds such as crabgrass begin to germinate.

When to Use Each

• Use pre-emergent weed control before expected weed germination.
• Use post-emergent weed control when weeds are already visible and actively growing.
• For better long-term control, many lawn programs use both at different times of the year.

Types of Post-Emergent Weed Killers

Broadleaf Weed Killers

Broadleaf herbicides target weeds such as dandelion, clover, chickweed, plantain and spurge. Many are selective and can be applied to compatible established lawns without killing the grass.

Grassy Weed Killers

Grassy weed herbicides are designed for weeds such as crabgrass, goosegrass and unwanted grasses. Product selection is important because some formulas may also damage certain lawn grasses.

Sedge Control

Sedge herbicides target weeds such as yellow nutsedge and purple nutsedge. Sedges are different from grasses and often require a product specifically labeled for sedge control.

Non-Selective Weed Killers

Non-selective herbicides control nearly any actively growing plant they contact. They are useful for spot treatments, lawn renovation, landscape beds, fence lines and other areas where complete vegetation control is needed.

Choosing the Right Post-Emergent Herbicide

Start by identifying the weed and confirming that the product is labeled for your grass type and treatment area. Some products control one weed category, while combination herbicides control multiple broadleaf, grassy and sedge weeds.

For best results, treat weeds while they are young and actively growing. Always follow the product label for application rates, temperature limits, watering, mowing and reseeding restrictions.