Preen® Mulch with Extended Control Weed Preventer

Preen Mulch with Extended Control Weed Preventer is rated 3.3 out of 5 by 208.
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Available at Lowe’s home improvement stores nationwide.

Preen® Mulch with Extended Control Weed Preventer is the only landscape mulch that comes with added Preen weed preventers already mixed in. In one easy step, apply mulch and block weeds* for up to 6 months – guaranteed! It’s available in three non-fade colors: Russet Red, Chestnut Brown, and Midnight Black – all guaranteed to stay colorfast all year.

While it is recommended to spread ordinary mulches 3-inches deep, Preen® Mulch with Extended Control Weed Preventer can be spread only 2-inches deep because of its additional built-in Preen weed barrier. This means that each bag covers 12 sq. ft. of ground. That’s 30% more ground coverage than ordinary mulches – while also providing effective, long-lasting control of broadleaf and grassy weeds!

Preen® Mulch with Extended Control Weed Preventer prevents 100 types of problem weeds, including tough dandelions, crabgrass, annual bluegrass, prickly sida, spurge, field bindweed ladysthumb, shepherd’s purse, Carolina geranium, black nightshade, plantain, chickweed, henbit, prickly lettuce, morning glory, horseweed/marestail, prostrate knotweed and many more. It stops weeds before they start, by keeping weed seeds from germinating. Weeds that don’t grow never need pulling!

In addition to preventing weeds and adding a professional, finished look to landscape beds, a layer of Preen® Mulch with Extended Control Weed Preventer helps to moderate soil temperature. Plus, it helps plants retain water to protect against heat and drought.

To view the available colors, including Russet Red, Chestnut Brown, and Midnight Black, please click on the Available Sizes tab below.

*See Use Directions for complete list of treated weeds.

Previously called Preen Mulch Plus®

Quick Links

Application

How to Apply

Bulbs and Perennials: Spread Preen Mulch with Extended Control Weed Preventer over the area to a depth of two inches. Do not plant flowers directly into garden mulch. If additional planting is desired after Preen Mulch has been applied, first remove the mulch from the selected area. Avoid getting treated garden mulch into the planting hole. Once the plant is firmly embedded in the soil, replace the mulch around the plant.

Annuals: After plants have been set in the soil bed, spread Preen Mulch with Extended Control Weed Preventer over the area to a depth of two inches. Make no more than one application per site per year.

When to Apply

Preen Mulch with Extended Control Weed Preventer contains pre-emergent herbicides and for best results, remove all weeds in the beds prior to applying the garden mulch. You may apply anytime in the spring and fall after renovating beds, but for best results, apply Preen Mulch with Extended Control Weed Preventer after flowers and ornamentals have been planted into the soil. Do not apply over flower seeds.

For ornamental bulbs, apply 2 to 4 weeks after planting, or before or after flowering. Do not apply to bulbs when flowering.

How Much Mulch Do You Need?

Although most mulches temporarily suppress weeds when applied at a minimum depth of 3 inches, only Preen Mulch with Extended Control Weed Preventer, with its weed barrier technology, blocks weeds for up to 6 months when applied 2 inches deep.

When applied according to label directions, one 2 cu. ft. bag of Preen Mulch with Extended Control Weed Preventer covers 12 sq. ft. at 2 inches deep. Other brands recommend 2 cu. ft. bags be applied at 3 inches deep, which will cover 8 sq. ft. With Preen Mulch with Extended Control Weed Preventer, you'll use fewer bags to cover more space than other brands and get much better weed control.

Enter your garden size to calculate the number of 2 cu. ft. bags of mulch needed.

Length ft inches
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Width ft inches

 

Preen Mulch with Extended Control Weed Preventer number of 2 cu. ft. bags needed  
Other brands number of 2 cu. ft. bags needed *  

(* Other brands recommend applying their mulch at 3 inches deep.)

FAQ

Coupons

Do you offer coupons, rebates, etc?

We, as the manufacturer of Preen, do not offer any coupons or rebates. However, very often our retailers or mass merchants offer their own special sale price, coupons or rebates. Local flyers, newspaper inserts and media advertising can alert you to these offers.

General Product Questions

What is the active ingredient in Preen® Mulch with Extended Control Weed Preventer?

0.0032% Trifluralin (Treflan) and 0.0008% Isoxaben (Gallery); excludes New York. ( In New York only, 0.0032% Trifluralin (Treflan)).

What are the other ingredients in Preen® Mulch with Extended Control Weed Preventer?

They are premium natural forest hardwoods and a dye colorant. Preen® Mulch with Extended Control Weed Preventer contains no recycled wood materials.

Is Preen® Mulch with Extended Control Weed Preventer single, double, or triple shredded?

Double shredded.

What weed seeds does Preen® Mulch with Extended Control Weed Preventer prevent from germinating?

See our list of weeds controlled or the product label.

How long does Preen® Mulch with Extended Control Weed Preventer prevent its label listed weed seeds from germinating and/or last in the soil?

Up to 6 months per application, excluding New York. In New York only, up to 4 months per application. The rate at which Preen® Mulch with Extended Control Weed Preventer biodegrades will depend on temperature, soil type, rain/moisture, sunlight and amount applied.

What weeds does Preen® Mulch with Extended Control Weed Preventer kill?

None; Preen® Mulch with Extended Control Weed Preventer helps to prevent its respective label listed weed seeds from germinating. It does not do a thing to existing weeds, their underground root/runner system, etc.

What does “established plant” mean on the Preen® Mulch with Extended Control Weed Preventer label?

The term “established plant” refers to flowers, trees and shrubs at least 3″in height, not recently transplanted and having a strong root system. An established groundcover is one not recently planted and that has spread or filled in to your satisfaction. (Note: Groundcovers will not spread while Preen® Mulch with Extended Control Weed Preventer is active, about 4–6 months).

What does “non-bearing fruit and nut trees” mean?

Plants that will not bear fruit for at least one year after treatment of Preen® Mulch with Extended Control Weed Preventer.

How does Preen® Mulch with Extended Control Weed Preventer work?

Preen® Mulch with Extended Control Weed Preventer creates a barrier that inhibits weed seed growth. The barrier lasts up to 4 weeks in New York, or up to 6 weeks in states other than New York.

Does Preen® Mulch with Extended Control Weed Preventer Cocoa Brown contain cocoa, cocoa shells, chocolate, or theobromine?

No; “cocoa brown” simply describes the color of the mulch.

What is the bag weight of Preen® Mulch with Extended Control Weed Preventer?

The approximate bag weight is 30 pounds. Preen® Mulch with Extended Control Weed Preventer is packaged/sold by volume, not by weight. Some settling may occur during shipment. Net content is 2 cubic feet with a coverage of 12 square feet, as validated by the Mulch and Soil Council.

Do you have a guarantee on your products?

Preen® Guarantee: To the extent consistent with applicable law, Lebanon Seaboard Corporation guarantees you will be satisfied with the performance of Preen® products when used as directed, or your money back. If not satisfied, describe the nature of your problem, and send with proof of purchase to:

Lebanon Seaboard Corporation
1600 East Cumberland St.
Lebanon, PA 17042

Proper Use

When do I apply Preen® Mulch with Extended Control Weed Preventer?

Anytime in the growing season when the ground temperature is at least 50–55 degrees, and after listed flowers and ornamentals have been planted into the soil. For ornamental bulbs: Apply 2 – 4 weeks after planting, or before or after flowering. Do not apply to bulbs when flowering.

Do I have to weed first before applying Preen Preen® Mulch with Extended Control Weed Preventer?

Yes; Preen® Mulch with Extended Control Weed Preventer does not kill existing weeds, so you must hand-pull existing weeds first. Note that Preen Preen® Mulch with Extended Control Weed Preventer will not control weeds that are tilled under.

When do I reapply Preen® Mulch with Extended Control Weed Preventer?

Reapply every 6 months, except in New York. Reapply every 4 months in New York only. However, make no more than one application per site per year for listed annuals.

When can Preen® Mulch with Extended Control Weed Preventer be put in a compost pile?

After 6 months (excludes New York), or after 4 months in New York only. However, it is recommended to keep it out of the compost process and let it break down naturally in the landscape bed.

Do I water Preen® Mulch with Extended Control Weed Preventer after application?

No.

Can I walk on a Preen® Mulch with Extended Control Weed Preventer treated area?

Avoid walking on a treated area; any disturbance will result in erratic weed prevention.

How much Preen® Mulch with Extended Control Weed Preventer do I apply?

Apply to a depth of two inches.

Can I plant plants directly into Preen® Mulch with Extended Control Weed Preventer?

No.

Can Preen® Mulch with Extended Control Weed Preventer be applied to plant roots or, wet or dry plant foliage?

No; plant injury could result. Immediately dry-brush Preen® Mulch with Extended Control Weed Preventer gently off plant foliage.

How do you use Preen® Mulch with Extended Control Weed Preventer with established bulbs and perennials?

Remove existing weeds, and apply Preen® Mulch with Extended Control Weed Preventer around listed bulbs and perennials.

How do I plant label recommended bulbs and perennials in an area that was already treated with Preen® Mulch with Extended Control Weed Preventer?

First, remove Preen® Mulch with Extended Control Weed Preventer from the selected area. Avoid getting treated mulch and soil in the planting hole. Once the plant is firmly embedded in the soil, replace the mulch around the plant.

How do you use Preen® Mulch with Extended Control Weed Preventer with established annuals?

After plants have been set in the soil bed, spread Preen® Mulch with Extended Control Weed Preventer over the area to a depth of 2″.

Does Preen® Mulch with Extended Control Weed Preventer control weeds that are tilled under?

No; weeds that are not completely removed will emerge again.

Can I use bare hands when handling Preen® Mulch with Extended Control Weed Preventer?

No; wear gloves when handling.

Will rain wash Preen® Mulch with Extended Control Weed Preventer away?

No; but heavy rains may shorten its effective period.

Staining

Can Preen® Mulch with Extended Control Weed Preventer stain?

The colorant in Preen® Mulch with Extended Control Weed Preventer can stain porous surfaces such as concrete, rocks, bricks, landscape blocks, shoes, leather, linoleum, etc.

How do I prevent possible staining?

Before watering Preen® Mulch with Extended Control Weed Preventer, dry brush stray granules off non target surfaces. Store Preen Preen® Mulch with Extended Control Weed Preventer packages in a garage or shed on top of cardboard or newspaper.

How can I try to get rid of a Preen® Mulch with Extended Control Weed Preventer colorant stain?

Try a pressure washer or a light detergent, such as Mr. Clean. Always test a small area first.

Storage & Safety

Where can I find emergency medical information for Preen® Mulch with Extended Control Weed Preventer?

Immediately call Prosar Corporation toll-free at (888) 208-1368 and/or 911.

Does Preen® Mulch with Extended Control Weed Preventer have any impact on earthworms or fungi in the soil?

No; the mulch component encourages soil organisms’ growth by moderating soil temperatures and conserving moisture.

Does Preen® Mulch with Extended Control Weed Preventer contain termites or other insects?

No; Preen® Mulch with Extended Control Weed Preventer does not contain termite-prone recycled wood materials. However, leave a 1″ to 3″ gap between the house and garden.

When can people and pets enter an area that was treated with Preen® Mulch with Extended Control Weed Preventer?

After dusts have settled from application.

How do I dispose of Preen Preen® Mulch with Extended Control Weed Preventer or its empty container?

Call your local municipality to inquire on proper product disposal and/or package recycling, or call 1-800-CLEANUP. If not recyclable and container is empty, place empty container in trash.

Does Preen® Mulch with Extended Control Weed Preventer expire?

No; it has an indefinite shelf-life as long as moisture and sunlight do not come in contact with the product.

Can Preen® Mulch with Extended Control Weed Preventer be stored for next year?

Yes; store in a dry place away from sunlight and moisture and place cardboard or newspaper underneath the product.

What can I do if I applied Preen Preen® Mulch with Extended Control Weed Preventer to my lawn, grass or flower seeds, a non-recommended plant, etc.?

The active ingredient should be neutralized using activated charcoal granules. Activated charcoal can be found at garden centers, pool supply stores, pet stores, or in the aquarium supply section of stores. Call the store first to confirm availability. Charcoal bricks used in a grill will not work.

  1. Sprinkle activated charcoal granules onto the soil surface at a rate of one pound per 100 square feet.
  2. Gently rake the activated charcoal into surface of soil.
  3. Thoroughly water the activated charcoal treated area.
  4. Repeat the watering schedule for three days.
  5. Cease watering and wait two days. After two days, the active ingredient in the product will be neutralized.

Use with Seeds and Young Plants

Will flower seeds germinate with Preen® Mulch with Extended Control Weed Preventer?

Flower seeds will not germinate or reseed while Preen® Mulch with Extended Control Weed Preventer is active.

When can I sow seeds or transplant non-recommended plants after an application of Preen® Mulch with Extended Control Weed Preventer?

Wait 6 months from when Preen® Mulch with Extended Control Weed Preventer was applied, except New York. In New York only, wait 4 months from when Preen® Mulch with Extended Control Weed Preventer was applied.

Use Around Vegetables

Can Preen® Mulch with Extended Control Weed Preventer be applied around an edible food plant?

No. Do not use Preen® Mulch with Extended Control Weed Preventer around food producing fruit or nut trees, vegetables, herbs, or other food plants.

What do I do if I applied Preen® Mulch with Extended Control Weed Preventer to vegetables, herbs, fruit trees, nut trees, or other edible food plant?

Remove Preen® Mulch with Extended Control Weed Preventer, dispose of the plant in a non-compost area, then thoroughly water the area. Do not eat harvest from the treated area for one growing season; replant in one year.

Where to Apply Preen

Can I use Preen® Mulch with Extended Control Weed Preventer in or near a pond, lake, or other type of waterway?

No; Preen® Mulch with Extended Control Weed Preventer is harmful to aquatic life.

Can I use Preen® Mulch with Extended Control Weed Preventer around, under, or near a swimming pool, sandbox, playground type areas, under bird feeders, etc.?

No.

Can I use Preen® Mulch with Extended Control Weed Preventer in or near a greenhouse or any type of enclosed area?

No; staining and/or volitization could occur causing plant injury.

Can I use Preen® Mulch with Extended Control Weed Preventer where chickens, horses, etc. graze?

No.

Can I use Preen® Mulch with Extended Control Weed Preventer on a garden slope or hillside?

Yes; if a waterway is not at the bottom of the slope/hillside.

What plants are recommended with Preen® Mulch with Extended Control Weed Preventer?

See our plant compatibility tool or the product label.

Can I use Preen® Mulch with Extended Control Weed Preventer around a non-label recommended plant?

Yes, but use caution. Make a trial application of Preen at the recommended rate around one or two plants. Observe the plants for 30 to 60 days. If plant injury results, do not use Preen around other plants of the same species. However, NEVER apply Preen® Mulch with Extended Control Weed Preventer around plants the label identifies as injury-prone. [NOTE: Consumer assumes liability for any plant damage resulting from the use of Preen around plant species not recommended on the label.]

How close can I apply Preen® Mulch with Extended Control Weed Preventer to a non-recommended plant?

We recommend keeping Preen® Mulch with Extended Control Weed Preventer at least 12″ outside the drip-line from a non-recommended plant.

Can Preen® Mulch with Extended Control Weed Preventer be used in potted plants or planter boxes?

Preen® Mulch with Extended Control Weed Preventer is not labeled for use in closed containers, and will injure plants.

Where to Buy Preen

Is Preen Preen® Mulch with Extended Control Weed Preventer available outside of the United States?

No; Preen Preen® Mulch with Extended Control Weed Preventer is not available or registered outside of the United States.

Can I order Preen Preen® Mulch with Extended Control Weed Preventer on your website?

No, but Preen® Mulch with Extended Control Weed Preventer is available at Lowe's and independent garden centers nationwide. Use our store locator to find a retailer near you.

Weeds Controlled

Available Sizes

  • click to enlarge
    Preen Mulch with Extended Control Weed Preventer - Russet Red (18 lbs)
    Covers 12 sq ft
    2464195
     
  • click to enlarge
    Preen Mulch with Extended Control Weed Preventer - Midnight Black (18 lbs)
    Covers 12 sq ft
    2464166
     
  • click to enlarge
    Preen Mulch with Extended Control Weed Preventer - Chestnut Brown (18 lbs)
    Covers 12 sq ft
    2464197
     

Reviews

To review a particular product within this family please choose from one of the available sizes below, or you may continue to write a review for Preen Mulch with Extended Control Weed Preventer without selecting a size.

Rated 1 out of 5 by from Color faded less than a week We recently purchased Preen Midnight Black Mulch and within days the color has faded. very disappointed in the results. It states color lasts all year, clearly it does not. Having issues with posting the photo.
Date published: 2018-10-13
Rated 1 out of 5 by from Preen patoo!! I bought bags of Preen Mulch to help in keeping the weeds at bay after I hand pick out all the weeds before putting down the mulch. I normally use pine needles as a mulch but thought I would give the Preen Mulch a try. BOY, was I ever wrong. I did this before going to Florida for the winter and I came home to so many weeds it is like a carpet of them in my front yard flower beds. So guess I will pull up my big girl pants and sit in the beds hand picking the weeds again and go back to pine needles. I am 78 years of age and would rather be doing other chores so stop marketing a product that does not work!! Virginia Beach
Date published: 2018-07-14
Rated 1 out of 5 by from Don't waste your money... I bought this product for the weed preventer. Went on vacation and came back to weeds growing. I spent many hours making sure all the weeds were pulled before applying the mulch. When the grass gets cut some lands into the mulch. I thought this product would be good but it doesn't work as advertised. I feel I wasted my money on a more expensive mulch. The cheaper one works just as well.
Date published: 2018-07-06
Rated 1 out of 5 by from Worst Worst product wish I could yhrow it out I have to use Ground Clear to koll weeds. Too hard to weed
Date published: 2018-06-19
Rated 1 out of 5 by from bad product Since I am getting up in years I thought this would be helpful in controlling weeds with less work on my part. Boy was I wrong! I now have at least double the work as my garden in full of poison ivy, milk weeds and some sort of thorny weeds! Never before have I had so many WEEDS and this product was suppose to help control weeds???
Date published: 2018-06-19
Rated 1 out of 5 by from Color Faded within 2 days Very dissatisfied that the midnight black mulch is light brown after only 2 days.
Date published: 2018-06-17
Rated 1 out of 5 by from Color faded after one day I purchase couple bags of this product because indicated available non-fade color Midnight Black – all guaranteed to stay colorfast all year. I layed mulch and later that afternoon did get showers of and on and the next day I can tell the difference where I layed this mulch versus old much. The color of old mulch is still holding while this much faded to just natural wood. Not happy with this product.
Date published: 2018-06-12
Rated 1 out of 5 by from Weed prevention doesn't work I spent hours pulling weeds out of my beds. We paid extra to help with weed prevention, and I wish we hadn't. There seem to be more weeds now than when we cleaned the beds to begin with. I dug up roots so I wouldn't have to deal with it. Save your money, it doesn't help at all. 28 bags, 3 inches deep, never again.
Date published: 2018-06-11
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