Preen Garden Weed Preventer: Blocks weeds for 3 months. Guaranteed

Home Gardens Preen Extended Control Weed Preventer

Preen Extended Control Weed Preventer

SKU 2464160

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Stop weeds* before they start for up to six months, guaranteed. Preen Extended Control Weed Preventer can be used around 600 plants in perennial flower beds; around groundcovers, trees and shrubs; and in arid landscapes and rock gardens


Select a Size

BOTTLE

4.93 lb.

Covers 805 sq. ft.

BOTTLE

4.93 lb.

Covers 805 sq. ft.

PAIL

13.75 lb.

Covers 2245 sq. ft.

BAG

10 lb.

Covers 1630 sq. ft.

BAG

21.45 lb.

Covers 3500 sq. ft.


  • Prevents new weeds* from growing for up to six months, guaranteed
  • Flip-top applicator cap makes application a breeze
  • When used as directed Preen Extended Control Weed Preventer can be used around more than 600 perennials, groundcovers, shrubs and trees as listed on the product label
  • Can be applied anytime during the growing season—spring, summer, or fall
  • Not intended for use on flower seeds, lawns, vegetable gardens, water gardens or other food-producing or edible plants
  • Not available for sale in NY

*Click to see a complete list of weeds controlled.

4 easy steps to free yourself from weeding™

1. Remove

Start by removing any existing weeds around trees, shrubs, xeriscapes, and perennial beds.

2. Sprinkle

Flip the top, tilt the bottle, and shake to distribute evenly. Works even better with mulch.

3. Integrate

Use a rake to work the granules into the top layer of soil or mulch or stone-covered bed.

4. Water

Water the area where applied to activate the protective weed barrier.

Watch, learn, then try for yourself

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 to fill in planting holes around plant roots, or injury may occur. Disturbing the soil surface after activation may result in erratic weed control.

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. Use a rake to work the granules into the top layer of soil or mulch. Then water the area where applied. 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 germinating.

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. Use a rake to work the granules into the top layer, while being careful to keep the granules away from plant roots and foliage. Water as directed. Always brush off or wash off stray weed preventer granules from plant foliage to avoid leaf damage or discoloration.

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.

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 that are sensitive to Preen Extended Control Weed Preventer (see list on label).

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 our list of weeds controlled on the product label.

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.

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, bond to the top soil 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.

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

annual bluegrass

annual bursage

annual ryegrass

Australian waterbuttons

barnyardgrass

bitter wintercress

bittercress

black medic

black mustard

black nightshade

bristly oxtongue

broadleaf plantain

buckhorn plantain

burning nettle

burnweed

California burclover

Carolina geranium

carpetweed

chamber bitter

cheat

cheeseweed mallow

chickweed

coast fiddleneck

common sowthistle

creeping woodsorrel

curly dock

dandelion

datura

dogfennel

dollarweed

dwarf horseweed

eclipta

evening primrose

fall panicum

field bindweed

field sandbur

filaree

Florida pusley

giant foxtail

goosegrass

groundsel

hairy bittercress

hairy fleabane

heath aster

henbit

hyssopleaf sandmat

Indian mustard

ivyleaf morningglory

jimsonweed

Johnsongrass

junglerice

kochia

ladysthumb

lambsquarters

large crabgrass

largebracted plantain

London rocket

long-stalk phyllanthus

low mallow

marestail

mayweed

Mexican sprangletop

mouseear chickweed

musk thistle

nettleleaf goosefoot

Pennsylvania smartweed

pennywort

petty spurge

pigweed

pokeweed

prickly lettuce

prickly sida

prostrate knotweed

purple cudweed

purslane

purslane speedwell

ragweed

rattail fescue

red sorrel

redmaids rockpurslane

redstem filaree

rockpurslane

Russian thistle

shaggy soldier

shattercane

shepherds purse

sibara

signalgrass

silversheath knotweed

slender aster

slender plantain

smooth crabgrass

southern crabgrass

spiny sowthistle

stinging nettle

stinkgrass

sunflower

sweetclover

swinecress

tall morningglory

tansymustard

telegraph weed

Texas signalgrass

thymeleaf speedwell

velvetleaf

Venice mallow

white clover

wild carrot

wild mustard

wild oat

wild radish

witchgrass

yellow foxtail

yellow woodsorrel

Bulbs, Flowers, Ground Covers & Ornamental Grasses

African iris

albo-marginata hosta

Algerian

amaryllis

angelita daisy

angels' hair

angelwing jasmine

apple blossom penstemon

asian jasmine

autumn joy stonecrop

bee balm

beechgrass

big blue lily turf

bigleaf

blackeyed magenta cranesbill

blackeyed susan

blanket flower

blue bell clematis

blue fescue

blue siberian iris

broom teatree/manuka

busy lizzie

cape weed

China aster

chrimson fountaingrass

chrysanthemum species

common yarrow

coral bells

coreopsis

cranesbill

crimson treasure cheddar pink

daylily

descampsia

deutschland astilbe

dotted loosestrife

dwarf

dwarf dahlia wendy pink

dwarf euryops

dwarf horsetail

dwarf katie ruellia

dwarf mondo grass

dwarf plumbago

dwarf umbrella grass

dwarf zinnia

English

eulalia grass

false or Mexican heather

fern

florist's chrysanthemum

fortnight lily

fountain grass

francee plantain lily

freeway daisy

garden petunias

gaura

gay feather

gazania

gazania

goblin blanket flower

gold coin daisy

golden hakonechloa

graham's sage

green/creeping lily turf

hardy pampasgrass

hartwig penstemon

heartleaf begonia

honeysuckle

ice plant

iceplant

ivy

ivy

ivy geranium

Japanese

Japanese spurge

kafir lily

largeleaf

lilac beauty lily turf

lily of the Nile

little hero marigold

lobelia

Madagascar periwinkle

majestic lily turf

Mexican bush sage

Mexican hat

mondo grass

monroe white lily turf

New England aster

New York aster

palace purple

pampas grass

Paris daisy

patriot plantain lilyl

periwinkle

periwinkle

periwinkle

Peruvian lily

peter's gold bidens

pink lisianthus

red abyssinian banana

red yucca

ribbon grass

Russian sage

santa claus fuchsia

sedge

silvery sunproof lily turf

siskiyou evening primrose

snapdragon

snow in the summer

society garlic

St. Johnswort

st. paul verbena

star cluster

statice

stock

swan river daisy new amethyst

sweet alyssum

threadleaf

trailing

trailing iceplant

trailing rosea iceplant

tree fern

variegated liriope lily turf

vera jameson stonecrop

Virginia creeper

wallflower

white ambassador begonia

white iceplant

white licorice plant

white lily turf

yellow dwarf bearded iris

zonal geranium

Shrubs

Abyssinica acacia

African sumac

America rhododendron

Amur maple

Andorra juniper

Anthony waterer spiraea

Aphrodite Rose of Sharon

Areca palm

Astilbe/false spirea

Atropurea-redleaf Japanese barberry

August beauty gardenia

Aurea-golden Japanese barberry

Aureus nana-dwarf golden arborvitae

Baileyi-dogwood

Baileyi-red-osier dogwood

Balkans holly

Bar harbor juniper

Barbara karst

Bearberry cotoneaster

Bigleaf wintercreeper

Blue boy holly

Blue cape plumbago

Blue chip juniper

Blue danube azalea

Blue girl holly

Blue juniper

Blue marguerite

Blue rug juniper

Blue star juniper

Bridal wreath

Bristol ruby weigela

Broadmoor juniper

Burford holly

Bush morning glory

Butterfly rhododendron

California gold

California privet

Camellia

Canadale gold euonymus

Cannon's double azalea

Cape honeysuckle

Cape mallow

Carolina jessamine

Carror azalea

Catawba album rhododendron

Catawba rhododendron

Century plant

Charisma-monruce rhaphiolepis

Cherry bomb barberry

China boy holly

China girl holly

Chinese fountain palm

Chinese lilac

Chioniodes rhododendron

Chirimen marlberry

Chollipo eunoymus

Christmas palm

Cinquefoil

Coast leucothoe

Common boxwood

Common lilac

Common snowball viburnum

Compacta-compact inkberry holly

Compacta-dwarf heavenly bamboo

Compacta-dwarf Japanese holly

Convexa holly

Copper leaf

Coral bark Japanese maple

Coral beauty smoke tree

Coral bells azalea

Cornish heather

Cotoneaster

Coyotebush

Cranberry bush

Cranberry cotoneaster

Creeping juniper

Creeping mahonia

Crepe myrtle

Crimson pygmy barberry

Cunningham white rhododendron

Daphinoides rhododendron

Dark knight bluebeard

David viburnum

Dolchia spiraea

Doublefile viburnum

Drooping leucothoe

Dusty-miller/silver ragweed

Dwarf andorra juniper

Dwarf brush cherry

Dwarf burford holly

Dwarf Chinese holly

Dwarf cranberry bush

Dwarf euryops

Dwarf Japanese maple

Dwarf Oregon grape

Dwarf pink flowering almond

Dwarf scarlet wonder rhododendron

Ebony magic holly

Edward Goucher abelia

Eichholz smoke tree

Elizabeth rhododendron

Emerald arborvitae

Emerald green juniper

Emerald n gold euonymus

Emerald sea shore juniper

Enchantress-moness rhaphiolepis

English lavender

English roseum rhododendron

English spike lavender

False spiraea

Fashion azalea

Feathery cassia

Filifera-thread cypress

First snow spiraea

Flame azalea

Flaviramea-dogwood

Flaviramea-yellowtwig dogwood

Flowering woodbine

Foemina-hicks juniper

Forest flame lily-of-the-valley

Formosa azalea

Forsythia border

Fortunes osmanthus

Fragrant daphne

Fraser's photinia

Fringe flower

Fruitland silver berry

Gardenia

Gerard christina azalea

Girard roberta azalea

Globosa-globe arborvitae

Glossy abelia

Glossy privet

Gold coast holly

Gold drop pontentilla

Gold spot euonymus

Golden fire azalea

Golden flare azalea

Golden flare exbury azalea

Golden privet

Goldfinger potentilla

Gomer waterer rhododendron

Green luster holly

Green pittosporum

Green velvet boxwood

Gumpo pink azalea

Harbor dwarf-heavenly bamboo

Hardy red oleander

Heavenly bamboo (nandina)

Helene Rose of Sharon

Helleri-heller's Japanese holly

Helmut vogel azalea

Henry garnet holly leaf sweetspire

Hershey red azalea

Hetzii's Japanese holly

Higasa azalea

Himalayan cotoneaster

Hino crimson azalea

Hino pink azalea

Hino-crimson azalea

Holandia-Scotch broom

Hollandia-Warminster broom

Hollywood juniper

Hopseed bush

Hot shot azalea

Howardi privet

Hume azalea

Huntington blue juniper

Inga azalea

Irene koster azalea

Ixora

Japanese alpine spiraea

Japanese aralia

Japanese boxwood

Japanese cleyera

Japanese painted fern

Japanese privet

Japanese skimmia

Japanese spurge

Japanese ternstroemia

Japanese yew

Java red weigela

Jean marie rhododendron

Klondike azalea

Korean boxwood

Koreanspice viburnum

Kosteri cypress

Lantana

Leather leaf mahonia

Lemon bottlebrush

Lena-Scotch broom

Lily-of-the-valley

Little giant-dwarf arborvitae

Lodense privet

Lolendei monrovia pyracantha

Lord roberts rhododendron

Media-old gold juniper

Mediterranean pink heather

Mentor barberry

Mildred azalea

Minima glauca-dwarf arborvitae

Minuet weigela

Monon pyracantha

Mountain fire lily-of-the-valley

Mountain laurel

Mugo-mugho pine

Mystery gardenia

Nakiana-dwarf deutzia

Nana compacta-heavely bamboo

Nana purpurea-heavenly bamboo

Nana-dwarf hinoki cypress

Nana-dwarf Japanese garden juniper

Nan-dwarf yaupon holly

Needle point holly

New Zealand tea tree

Nigra-dark American arborvitae

Nordica-inkberry holly

Nova zembla rhododendron

Oleander

Paraguay nightshade

Parsonii juniper

Pendula-weeping yaupon holly

Pfitzer juniper

Pfitzerana glauca-blue juniper

Pfitzerana-pfitzer juniper

Pigmy date palm

Pink breath of heaven

Pink dawn viburnum

Pink pixie

PJM rhododendron

Plum yew

Plumbago

Plumosa-andorra juniper

Praecox-early cotoneaster

President clay azalea

Prostrata juniper

Prostrate acacia

Purple bell heather

Purple gem rhododendron

Pyramidalis arborvitae

Pyrenees cotoneaster

Queen Anne Lily of the Nile

Radican gardenia

Ramanas rose

Ramapo rhododendron

Red ace potentilla

Red apple aptenia

Red bird Rose of Sharon

Red elf hybrid pyracantha

Red heart Rose of Sharon

Reeve's skimmia

Reijn azalea

Rhaphiolepsis (India hawthorn)

Rheingold arborvitae

Rhodie max (rosebay)

Rhododendron

Rock cotoneaster

Rocket rhododendron

Rose glow barberry

Rosemary

Ross estey-hibiscus

Roundleaf rhaphiolepis

Royal purple smoke tree

Ruby lace oleander

Rutgers hybrid pyracantha

Sago palm

Salal/lemon leaf

San jose holly

Santa cruz pyracantha

Savannah holly

Savin juniper

Scarlet O'hara

Scintillation rhododendron

Sea green juniper

Serotina woodbine

Shirobana spiraea

Shoestring acacia

Shore juniper

Sibirica-Siberian dogwood

Silver king euonymus

Slender gracilis

Snow azalea

Snowdrift lily-of-the-valley

Snow-in-summer

Spreading euonymus

Spring bouquet viburnum

Spring cinquefoil

Spring glory forsythia

Spring torch Scotch heather

Springtime-monme rhaphiolepis

Squarrosa minima cypress

Stokesii Japanese holly

Summersweet

Sunset potentilla

Sunspot euonymus

Sweet pea shrub

Tamariscifolia-tam juniper

Tangerine potentilla

Tassel fern

Tea viburnum

Techny arborvitae

Temple bells lily-of-the-valley

Temple fire

Texas dawn

Torulosa cypress

Torulosa-Hollywood juniper

Tradition azalea

Tribly rhododendron

Trumpet honeysuckle

Unique rhododendron

Valley rose lily-of-the-valley

Valley valentine lily-of-the-valley

Variegated evergreen euonymus

Viburnum

Vicary golden privet

Victory pyracantha

Vulcan rhododendron

Waucabusa azalea

Wax leaf privet

Wax ligustrum

Wax myrtle

Wayfaring tree

Weeping bottlebrush

Wheeler's dwarf pittosporum

Wild lilac

William Penn barberry

Wiltonii-blue carpet juniper

Winter honeysuckle

Woadwaxen

Woodbridge rose of sharon

Woods dwarf-heavenly bamboo

Woodwardii arborvitae

Xylosma

Yaupon holly

Yellow tip ligustrum

Yewpine

Yucca

Trees

Albus-flowering maple

American sweetgum

American sycamore

Arizona cypress

Australian tree fern

Austrian black pine

Babylon weeping willow

Balsam fir

Banana

Beach pine shore pine

Bear oak

Black olive

Bosnian pine

Bottle tree

Bristlecone pine

California sycamore

Canary island pine

Carob

Carrot wood

Cat palm

Chilean mesquite

Chinese elm

Cloud nine dogwood

Columnar Scotch pine

Conica-dwarf Alberta spruce

Coolibah tree

Corkscrew willow

Cottonwood

Dwarf Alberta spruce

Dwarf globe blue spruce

Eastern hemlock

Eastern red cedar

Eastern white pine

Eldarica pine

Emerald island leyland cypress

Ficus

Filicoides-fernspray cypress

Flame maple

Florida anise-tree

Flowering dogwood

Giant sequoia

Gilt edge silverberry

Ginkgo (maidenhair tree)

Glauca-Colorado blue spruce

Gracilis-slender hinoki cypress

Green hawthorn

Honey locust

Hoopsii-hoop's blue spruce

Italian cypress

Japanese black pine

Japanese cryptomeria

Koster-koster blue spruce

Live oak

Luteus-flowering maple

Mahogany

Mealy eucalyptus

Mexican fan palm

Mini ficus

Monterey pine

Norway spruce

Palm

Paper birch

Parlor palm

Pendula-weeping Norway spruce

Pin oak

Podocarpus

Pumilio-shrubby Swiss mountain pine

Queen palm

Red gum eucalyptus

Red ironbark eucalyptus

Red maple

Red oak

Red sunset maple

Redbud

Repens-spreading Norway spruce

River birch

Roseus-flowering maple

Russian olive

Sawara-false cypress

Scotch pine

Shademaster honey locust

Shamel ash

Silver dollar eucalyptus

Silver maple

Sourwood

Southern magnolia

Squarrosa-moss cypress

Tangerine-flowering maple

Tasmanian tree fern

Toyon

Vesuvius red-flowering maple

White fir

White mulberry

White pine

Willow oak

Yellow tab

Yoshino flowering cherry

Non-bearing Fruit & Nut Trees and Non-bearing Vineyards

Almond

American grape

Apple

Apricot

Avocado

Blackberry

Blueberry

Boysenberry

Currant

Dewberry

Elderberry

English walnut

European Grape

Fig

Filbert

Gooseberry

Grapefruit

Kiwi

Lemon

Loganberry

Macadamia nut

Nectarine

Olive

Orange

Peach

Pear

Pecan

Pistachio

Plum

Pomegranate

Prune

Raspberry

Sour cherry

Sweet cherry

Walnut