Extended Control Weed Preventer


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For 50 years, gardeners have trusted Preen Weed Preventer products to help keep their garden and landscape beds weed-free for months. Preen Extended Control Weed Preventer is the longest lasting Preen yet, stopping weeds for up to six months per application. It’s labelled for use around 600 plants in perennial flower beds; around groundcovers, trees and shrubs; and in xeriscape settings and rock gardens. Preen Extended Control Weed Preventer tackles many of the toughest weeds a gardener faces, including: dandelions, crabgrass, field bindweed, white clover, chickweed, henbit, purslane, Carolina geranium, stinging nettle, horseweed or marestail, oxalis, spurge, lambsquarters and more.

Preen’s jug-handled bottle with a flip-top applicator cap makes Preen Extended Control Weed Preventer easy to apply. Simply flip open the top, tilt the bottle and start shaking it to evenly distribute the product granules on top of soil or mulch. Water in the treated area to activate the protective weed barrier. That’s all it takes to stop listed grassy and broadleaf weeds for up to six months.

Best of all, by applying Preen Extended Control Weed Preventer just 2 times per year you can get year-round protection from new weeds. No weeds means no time wasted weeding!


How to Apply

Preen Extended Control Weed Preventer is not a weed killer – it stops new weeds from sprouting. First remove any existing weeds that may be growing. Then apply Preen Extended Control Weed Preventer using the easy-to-use bottle with flip-top applicator-cap. Sprinkle the product granules on top of the soil or mulch at the rate recommended on the label. Once the product is activated by watering, it forms an invisible weed control barrier in the top layer of soil (1 – 3 inches), preventing new weeds from growing. If it’s not possible to water in the product right away, and no rain falls within two days, use a rake to work the product into the soil or mulch.


When to Apply

Preen Extended Control Weed Preventer can be applied up to two times per year around established plants and transplants. A first application can be made any time throughout the growing season -- spring, summer or fall. For ongoing weed-protection, a second seasonal application can be made two to six months after the first application.

When planting or transplanting into an area treated within the past 12 months, use fresh soil as fill in planting holes. Disturbing the soil surface after activation may result in erratic weed control.

NOTICE: Some products in this store can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Please check the product label for warning information. For more information go to We cannot ship any products into California that are affected by Proposition 65.

SHIPPING CHANGES: Due to new sales tax rules in the state of Colorado, effective June 1, 2019, purchases made online through JAX Mercantile for customers in the state of Colorado will only be able to be shipped to addresses within JAX current tax jurisdictions in Fort Collins, Loveland, Lafayette, and Broomfield. Customers in the state of Colorado who do not have shipping addresses within these zip codes may still opt for in-store pickup at any JAX store location when making a purchase on the JAX website. Learn more on our shipping and returns page.

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