Preen 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!

Quick Links

Application

Application

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.

Applying Around Established and Transplanted Plants

When used as directed, the product can be used around more than 600 listed perennials, groundcovers, shrubs and trees. For the full list, see product label. To apply around established perennials, ground covers, shrubs and trees: sprinkle Preen® Extended Control Weed Preventer evenly over the entire soil surface, at the rate of .98 oz per 10 sq ft. Keep the granules away from plant roots and foliage. Always brush off or wash off stray weed preventer granules from plant foliage to avoid leaf damage or discoloration. If it is not convenient to water-in quickly and rain is not expected within two days, lightly rake the granules into the top layer of soil or mulch.

Applying with Mulch

For best weed control, we recommend applying Preen® Extended Control Weed Preventer after spreading mulch on your perennial flower, shrub and landscape beds. Sprinkle Preen®on top of the mulch at the same rate as recommended for application directly to soil.

Not for Use With:

This product should not be used on flower seeds, lawns, vegetable gardens or water gardens. It also is not for use around food-producing or edible plants, including herbs and fruit-bearing nut or fruit trees, or around a short list of plants which are sensitive to Preen® Extended Control Weed Preventer (see list on label).

NOTE:

This is not the product label. Always read and follow directions on the product label. Use only as directed. Not available in New York.

FAQ

Coupons

Do you offer coupons, rebates, etc?

Very often our retailers or mass merchants offer their own special sale price, coupons or rebates. Local flyer, newspaper inserts, and media advertising can alert you to these offers.

General Product Questions

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

There are two:

1.500% Trifluralin

0.375% Isoxaben

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

In addition to the active ingredient, Preen® Extended Control Weed Preventer contains a biodegradable carrier agent made of corn cob and/or biodac (recycled newsprint).

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

See the product label for a list of grassy and broadleaf weeds controlled.

How long does Preen® Extended Control Weed Preventer prevent weed seeds from germinating?

Up to 6 months per application. Heavy rain or excessive heat and humidity weather conditions may shorten the effective period.

How long does Preen® Extended Control Weed Preventer stay in the soil?

Approximately 6 months per application. The rate at which Preen® Extended Control Weed Preventer biodegrades will depend on temperature, soil type, rain/moisture, sunlight and amount applied.

What weeds does Preen® Extended Control Weed Preventer kill?

None. Preen ® Extended Control Weed Preventer helps to prevent germination of seeds from the list of weeds shown on the label for up to 6 months per application. It does not kill or inhibit existing weeds in any way.

How much water must I apply to activate Preen® Extended Control Weed Preventer?

After application, you only need to apply enough water to thoroughly wet the surface of the soil. The granules will not dissolve when watered in. They will disintegrate over a period of weeks.

What are the particles on the soil surface after I watered Preen® Extended Control Weed Preventer?

Once Preen® Extended Control Weed Preventer is watered in, the carrier, such as corn cob or biodac will remain on the surface and biodegrade within a month or so.

How does Preen® Extended Control Weed Preventer work?

Preen® Extended Control Weed Preventer works to create an invisible barrier that inhibits weed seed growth. The barrier can last up to 6 months.

Will rain wash Preen® Extended Control Weed Preventer away?

  No, the active ingredient bonds to soil particles in the top layer of soil. But excessively warm wet conditions may shorten its effective period.

Why is the Preen® Extended Control Weed Preventer container not completely full?

Our product container is packaged/sold by weight, not by volume. If you weigh the container you will find that the weight is as stated or slightly higher.

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

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

Apply at least 12″ outside the drip-line of a non-recommended plant.

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

This term refers to perennials, trees and shrubs that are at least 3-inches in height, have not recently transplanted and have a strong root system. For recently transplanted plants: do not apply Preen® Extended Control Weed Preventer until plants have been watered once or twice to make sure the soil is well and uniformly settled by packing or irrigation around the plants. An established ground cover is one that is not recently planted, is well-rooted and has spread and filled in to your satisfaction. Note: Groundcovers will not spread where Preen® Extended Control Weed Preventer is active (about 4–6 months).

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

This term refers to established fruit and nut trees that have not matured to the point of producing a harvest. Preen® Extended Control Weed Preventer can be applied around the label listed non-bearing fruit and nut trees until they begin bearing fruit or nuts; otherwise, it cannot be applied.

When do I apply Preen® Extended Control Weed Preventer?

A first application can be made at any time throughout the growing season -- spring, summer or fall. To establish a 12-month weed-protection cycle, reapply the product in six months.

Is there a benefit to applying Preen® Extended Control Weed Preventer in the fall?

September and October are perfect months for a fall application as many winter annual weeds actively germinate and grow slowly in fall and even over winter. When applied in fall, the product helps reduce these weeds in early spring and thus makes spring garden preparation easier.

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

Yes. Preen® Extended Control Weed Preventer does not kill existing weeds. First get rid of existing weeds, roots and all, then apply Preen® Extended Control Weed Preventer. If there is no opportunity to remove weeds first, an initial application can be utilized to prevent further weeds until you have an opportunity to clear the garden and landscape beds.

When do I reapply Preen® Extended Control Weed Preventer?

To establish a 12-month weed-protection cycle, reapply the product six months after the prior application. Should excessively warm wet conditions shorten the effective period, it is okay to reapply 60 days or more after the prior application. Do not apply more than three times per year.

Can Preen® Extended Control Weed Preventer be applied when plant foliage is wet?

Yes, but only if you immediately wash off any stray granules that stick to wet leaves as wet granules can damage or discolor plant foliage. Much easier is to apply the product when leaves are dry, as then granules that land on foliage can be readily brushed off by hand.

Does Preen® Extended Control Weed Preventer need to be watered-in?

Yes; rain or water must immediately follow application to activate the product.

What happens if rain or water does not immediately occur after application?

Preen® Extended Control Weed Preventer will not start to work until activated by rain or watering. If watering is not an option, time your application to coincide with expected rain, or lightly rake the granules into the soil to protect the active ingredient from UV degradation by sunlight until rain occurs.

How much Preen® Extended Control Weed Preventer should I apply?

For label recommended flowers, trees, shrubs, and groundcovers, sprinkle granules lightly and evenly over the soil. Apply approximately .98 oz per each 10 square feet, or 6.125 lb per 1,000 square feet.

Can Preen® Extended Control Weed Preventer be applied on plant foliage or exposed plant roots?

No; plant injury could result.

What do I do if Preen® Extended Control Weed Preventer accidentally got on plant foliage during application?

You should immediately brush off any granules that fall on dry plant foliage. If any granules fall on wet foliage, you should thoroughly and immediately rinse them off with a garden hose.

How do you use Preen® Extended Control Weed Preventer with flowers, trees, and shrubs?

Remove existing weeds and weed roots. Then apply Preen® Extended Control Weed Preventer to soil or mulch around established plants and transplants. Then water in thoroughly.

How do you use Preen® Extended Control Weed Preventer with groundcovers?

Check that your groundcovers are listed on the product label. If they are fully established and have spread as you desire, then apply Preen® Extended Control Weed Preventer around the dry foliage and water in immediately.

Why can't I apply Preen® Extended Control Weed Preventer to muck (constantly wet) soil or soils containing more than 10% organic matter?

These types of soils will neutralize the active ingredients in Preen® Extended Control Weed Preventer.

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

Preen® Extended Control Weed Preventer may be applied for the control of annual weeds in ornamental bulbs, e.g., bulbous iris, daffodil (narcissus), hyacinth and tulip. Apply this product on top of the soil 2 to 4 weeks after planting but prior to the emergence of annual weeds. This product may also be applied following bulb emergence but prior to flowering and after flowering. For fall planted bulbs, apply the product in late winter or early spring to soil surface.

Do not apply to tulip plants that have emerged to a height greater than 3/4 inch. Do not apply to gladiolus prior to emergence or if corms are less than one inch in diameter. Do not apply to bulbs while they are flowering.

Does Preen® Extended Control Weed Preventer control weeds that have been tilled under?

No; already growing weeds that are not completely removed will emerge again. Start with a clean slate: remove existing weeds, roots and all. Then apply Preen® Extended Control Weed Preventer.

Do I apply Preen® Extended Control Weed Preventer by hand?

No; 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, then water in to activate.

Can I mix Preen® Extended Control Weed Preventer with water before application?

No; mixing with water dilutes the active ingredients and renders the product ineffective.

How long after an application of Preen® Extended Control Weed Preventer should I wait before planting non label-recommended plants?

You should wait 12 months.

Staining

Can Preen® Extended Control Weed Preventer stain?

Yes; Preen® Extended Control Weed Preventer can stain porous surfaces such as concrete, rocks, bricks, landscape blocks, shoes, leather, linoleum, vinyl, shoes, and carpet.

How do I prevent possible staining?

Never apply Preen® Extended Control Weed Preventer when any surrounding porous surface is wet. Sweep off or dry brush off stray granules from any non-target surface before watering the area to activate the product. To avoid surface staining in storage, place the bottle on top of a piece of cardboard or thick newspaper, not directly on shelving or flooring such as linoleum, vinyl, tile, cement or carpet.

How can I get rid of a Preen® Extended Control Weed Preventer stain?

Try Goo Gone or another citrus-based cleaning product to lessen the appearance of or remove a stain. Always test a small area first to ensure the product won't cause additional staining.

For porous surfaces: Use equal parts soapy water and bleach, or a paste of baking soda and water, or ultraviolet light/sunlight, or a citrus-based cleaner, or 409 carpet foaming spray cleaner. Always follow manufacturer's directions.

For non-porous, uncoated surfaces: Use acetone or an acetone based nail polish remover.

Human & Pet Safety

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

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

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

They may enter the treated area after it is thoroughly dry from the first rain or watering.

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

Limit walking on a treated area, as soil disturbance will result in erratic weed prevention.

Product Misapplication

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

The active ingredient should be neutralized using activated charcoal granules (also called activated carbon). 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. After two days, the active ingredient in the product will be neutralized
Preen® Extended Control Weed Preventer was over-applied in my garden. How can I save my plants from injury?

If rain or watering did not occur: Physically remove Preen® Extended Control Weed Preventer granules.

If rain or watering did occur, or if you were unable to physically remove the granules, neutralize the product following these steps:

The active ingredient should be neutralized using activated charcoal granules (also called activated carbon). 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. After two days, the active ingredient in the product will be neutralized.

Use Around Seeds and Young Plants

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

Wait 6 months before planting seeds in an area treated with Preen® Extended Control Weed Preventer. Flower seeds will not germinate for up to 6 months per application.

How long after an application of Preen® Extended Control Weed Preventer should I wait before planting label-listed annual flower transplants?

If you will plant straight into the treated soil, you should wait 12 months from your last application. But, there’s no need to wait if you keep treated soil out of the planting hole and, after positioning the plant, backfill the hole with fresh untreated soil or a planting mix. Preen®granules should not come in contact with plant roots at any time. If possible, it is recommended to plant first, then apply Preen® Extended Control Weed Preventer.

I have planted my annual flower transplants. How long do I need to wait to apply Preen® Extended Control Weed Preventer?

Preen® Extended Control Weed Preventer may be applied around any label listed transplant after the plants have been watered once or twice to make sure the soil is uniformly settled around the plants. Avoid getting granules on plant leaves. Water area immediately after application.

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

  Preen® Extended Control Weed Preventer is NOT approved for use in vegetable gardens.

Use with Mulch

Should Preen® Extended Control Weed Preventer be applied before the mulch is applied (directly on the soil) or on top of mulch?

Though the product works either way, we feel it is preferable to apply Preen® Extended Control Weed Preventer on top of mulch. The product stops weed seeds from rooting for six months whether they’re already present in the top layer of garden soil or mulch or are carried in by the wind, birds or animals during that time

Where to Apply Preen

Can I use Preen® Extended Control Weed Preventer on my lawn or with grass seed or sod?

No; turf injury could result. Preen® Extended Control Weed Preventer is not labeled for use on lawns.

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

No; Preen® Extended Control Weed Preventer is harmful to aquatic life. Do not use if there might be any chance of runoff into the water.

Can I use Preen® Extended Control Weed Preventer around, under, or near a swimming pool, sandbox, playground type area, or under bird feeders?

No.

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

No; plant injury could result.

Can I use Preen® Extended Control Weed Preventer where chickens, horses or other animals graze?

No.

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

Yes, if a waterway is not at the bottom of the slope or hillside.

Can I use Preen® Extended Control Weed Preventer on decorative stones or pebbles?

Preen® Extended Control Weed Preventer can stain porous materials such as stone or brick. Before treating your entire area, do an application to a small area to test for staining, which would appear within a few days. Always apply when stones are dry and water thoroughly immediately after application.

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

See the long list of compatible plants on the product label. Also note on the label the list of plants around which Preen® Extended Control Weed Preventer should NOT be applied.

Can I use Preen® Extended Control Weed Preventer with a plant that is not listed on the product label?

If you wish to use Preen® Extended Control Weed Preventer on plant species not listed on this label, you should determine the suitability for use by treating a small number of such plants. Prior to treatment of larger areas, the treated plants should be observed for any sign of herbicidal injury for 30 to 60 days of normal growing conditions. The user assumes responsibility for any plant damage or other liability resulting from use of Preen® Extended Control Weed Preventer on plant species not listed in this label. Do not apply to any plant-intended for food or feed.

Storage and Disposal

Does Preen® Extended Control Weed Preventer expire?

No. Preen® Extended Control Weed Preventer has an indefinite shelf-life as long as it is sheltered from moisture and sunlight.

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

Yes; store in a dry place away from sunlight and moisture. Place the bottle on a piece of cardboard or newspaper, not directly on a linoleum, cement, vinyl, tile, or a carpeted surface, as staining may occur.

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

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

Weeds Controlled

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