Monterey Weed Impede, manufactured by Monterey, is a great pre-emergent herbicide that prevents and controls various grassy and broadleaf weeds in warm-seasoned turf, landscape ornamentals, and around non-bearing fruit and nut trees.

This surface applied product releases its active ingredient oryzalin 40.40% into the soil to stunt germinating weeds, thus blocking the growth of weeds successfully within 30 days.

Monterey Weed Impede is a long-lasting pre-emergent herbicide that provides up to 6 months of control of annual grass and broadleaf weeds, resulting in reduced labor and better chance of an aesthetically pleasing turf.

Tools Needed

To apply Monterey Weed Impede, you will need to use either a handheld pump sprayer or backpack sprayer.

How to Use

• Step 1: Determine how much Monterey Weed Impede to use by measuring the square footage of the treatment area. To do this, measure the length and width of the treatment area in feet then multiply them together (length X width = square footage). For ornamental applications, apply 3 fl. oz. of Monterey Weed Impede in 2 gallons of water per 1,000 sq. ft. To treat warm-seasoned grass in states other than Florida, use a rate of 1 to 1.5 fl. oz. of product in 2 gallons of water per 1,000 sq. ft. For warm-seasoned grass in Florida, use 1 fl. oz. of product in 2 gallons of water per 1,000 sq. ft. Refer to the label for specific application rates and restrictions.
• Step 2: Place the sprayer on a level surface before mixing. Add half the amount of water, then pour in the measured amount of Monterey Weed Impede. Next, add the remaining half of water then agitate the sprayer to mix.
• Step 3: Broadcast the mixed Monterey Weed Impede solution to the top and bottom of turf and ornamental blades until wet, but not to the point of runoff. For ornamentals bulbs, you will need to apply the product to the soil surface 2 to 4 weeks after planting, but prior to the emergence of annual weeds. For fall planted bulbs, apply this product again in late winter or early spring to weed-free soil surfaces. If no rainfall has occurred 7 days after application, then apply 1/2 inches of irrigation.

Where to Use

Monterey Weed Impede can be used in landscape ornamentals, rock gardens, ornamental bulbs, ornamental bedding plants, ground covers, non-bearing fruit and nut trees, non-bearing vineyards, established warm-seasoned turf and nonplanted areas.

Do not apply to areas containing dichondra or cool season turfgrass species.

When to Use

Use Monterey Weed Impede when turf and ornamental are well-established. No emerged weeds should be present at the time of application,

Do not apply to plants that bear edible fruits, flowers, forage, roots or seeds.

Safety Information

Monterey Weed Impede is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when mixing and applying this product.

Keep all persons, children and pets out of treated area until sprays have dried.

Special Considerations

Applications of Monterey Weed Impede over the top of plants with newly forming buds may cause injury. In this situation a directed spray is recommended or irrigate immediately after application to wash this product into the soil.