Home Gardens Preen Garden Weed Preventer

Preen Garden Weed Preventer

SKU 2464117

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Stop weeds from growing for three months, guaranteed. Preen Garden Weed Preventer can be used around 200 established plants in flower beds and vegetable gardens, in ground covers, and around trees and shrubs.

Select a Size


5.625 lb.

Covers 900 sq. ft.


5.625 lb.

Covers 900 sq. ft.


13 lb.

Covers 2080 sq. ft.


16 lb.

Covers 2560 sq. ft.


31.3 lb.

Covers 5000 sq. ft.

  • Prevents new weeds* from growing for three months, guaranteed
  • Flip-top applicator cap makes application a breeze
  • Safe to use around 200 established flowers, vegetables, trees, and shrubs, as listed on the product label
  • Can be applied anytime during the growing season—spring, summer, or fall
  • Eliminate the need for hand-weeding by applying Preen early
  • Weed preventer stops weed seeds from germinating - does not kill existing weeds
  • Not for use on lawns

*Click to see a complete list of weeds controlled.

4 easy steps to free yourself from weedingTM

1. Remove

Start by removing any existing weeds around flowers, vegetables, trees, and shrubs.

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 control barrier beneath the soil.

Watch, learn, then try for yourself

Apply Preen Garden Weed Preventer during the growing season around established plants and transplants. Preen should not be used on flower seeds. It can be used after flowering plants have germinated and are 2-3 inches tall. Preen may also be incorporated into the soil when seeding vegetables or applied after mulching beds. By applying Preen as early as possible, you can eliminate the need for hand‑weeding.

Rain does not wash this product out of the soil. To keep beds weed‑free all season long, reapply Preen weed preventer every 9-12 weeks.

First remove any existing weeds that may be growing. Then apply Preen Garden Weed Preventer using the easy-to-use bottle with flip-top applicator-cap. When plants are dry, 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. Once activated by watering, it forms a weed control barrier in the top layer of soil, preventing weed seeds from germinating. Disturbance to the soil surface after activation may result in erratic weed control.

For flowers, roses, herbs, ground covers, ornamental grasses, shrubs, trees, and listed vegetables at least 2-3 inches tall, sprinkle Preen Garden Weed Preventer evenly over the entire soil surface at the rate of 1 oz per 10 sq. ft. Be sure to keep granules away from plant roots and foliage. Integrate with a rake and then immediately water. Always wash or brush off stray weed preventer granules from plant foliage to avoid damage or discoloration.

If using standard mulch (and not Preen Mulch with Extended Control Weed Preventer which includes weed prevention), we recommend applying Preen Garden Weed Preventer after spreading the mulch on your flower and shrub beds for best weed control. Sprinkle Preen on top of the mulch and integrate with a rake. Be sure to keep granules away from plant foliage. Immediately water this product into the mulch. Always wash or brush off stray granules from plant foliage to avoid damage or discoloration.

What is the active ingredient in Preen® Garden Weed Preventer?

1.47% Trifluralin (Treflan).

What are the other ingredients in Preen® Garden Weed Preventer?

Preen® Garden Weed Preventer contains a carrier agent such as corn cob and biodac (recycled newsprint) in addition to the active ingredient.

What weed seeds does Preen Garden Weed Preventer prevent from germinating?

See our list of weeds controlled on the product label.

How long does Preen Garden Weed Preventer prevent weed seeds from germinating?

Up to 12 weeks per application. Reapplication may be necessary sooner during periods of heavy rain or excessive heat and humidity; or if you have porous, sandy type soil.

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

Approximately 8 – 12 weeks per application. The rate at which Preen® Garden Weed Preventer biodegrades will depend on temperature, soil type, rain/moisture, sunlight and amount applied.

What weeds does Preen® Garden Weed Preventer kill?

None. Preen ® Garden Weed Preventer helps to prevent germination of seeds from the list of weeds shown on the label for up to 12 weeks 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® Garden Weed Preventer?

Once Preen® Garden Weed Preventer is watered in, the carrier, such as corn cob or biodac will remain on the surface and biodegrade over time.

How does Preen® Garden Weed Preventer work?

Preen® Garden Weed Preventer works to create a barrier that inhibits weed seed growth. The barrier can last up to 12 weeks.

Why is the Preen® Garden 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

Bulbs, Flowers, Ground Covers & Ornamental Grasses

Aaronsbeard Hypericum calycinum

African Lily Agapanthus africanus

alyssum Lobularia maritima

angel wing jasmine Jasminum nitidum


asparagus fern Asparagus densiflorus


baby's breath Gypsophila paniculata


Beard tongue Penstemon

Bee balm


bellflower Campanula

Big Blue lily turf Liriope muscari

blackeyed Susan Rudbeckia hirta

Bleeding heart




Cape weed Arctotheca calendula

Carex (variegated)

carnation Dianthus caryophyllus

Carpet bugle

Ceanothus Ceanothus

Centaurea (Velvet)

Chrysanthemum Chrysanthemum

coneflower Echinacea purpurea



crown vetch Coronilla varia

Cypress (Squarrosa-moss) Chamaecyparis pisifera 'Squarrosa'


Daisy (African) Arctotis stoechadifolia

Daisy (Painted)

Daisy (Trailing African)

daisy Leucanthemum X superbum

day lily Hemerocallis



dusty miller Centaurea cineraria

Fern (Japanese Painted)

Fern (Tassel)

Fescue (blue)

Fescue (Floss flower)

forget me not Myosotis

fountain grass Pennisetum setaceum

Four o'clock Mirabilis

foxglove Digitalis


garden phlox Phlox

gayfeather Liatris

gazania Gazania

germander Teucrium


glads Gladiolus

Golden glow

Grass (beach)

Grass (Dwarf Mondo)

Grass (Eulalia)

Grass (Mondo)

Grass (Ribbon)

Grass (Zoysia)


Hakonechloa (Golden)

hardy geranium Geranium

hollyhock Alcea rosea

Hosta (Albo-marginata)

hyacinth Hyacinthus

Ice plant (Largeleaf)

Ice plant (Trailing)

Ice plant (White)

Impatiens Impatiens

Iris (Bulbous)

Ivy (California)

Ivy (Needlepoint)

ivy Hedera helix

Ivy Hedera helix ssp. canariensis

Ixora Ixora

jonquil Narcissus

Lamb's ears

lantana Lantana

lavender Lavandula angustifolia

Lily turf (Creeping) Liriope spicatum

Lily turf (Green)

Lily turf (Lilac beauty) Liriope muscari 'Lilac Beauty'

Lily turf (Majestic) Liriope muscari 'Majestic'

Lily turf (Silvery sunproof) Liriope muscari 'Silvery Sunproof'

Lily turf (Variegated liriope)

Lily turf (White)

lobelia Lobelia

lupine Lupinus

marigold Dimorphotheca

marigold Tagetes

Mascarene grass Zoysia tenuifolia

Morning glory Ipomoea

Myoporum Myoporum

nasturtium Tropaeolum

pampas grass Cortaderia selloana

periwinkle Vinca

Peter Pan (Dwarf)

Petunia Petunia

Pincushion flower Chaenactis fremontii

poppy Eschscholzia californica

Portulaca Portulaca

rockrose Cistus

rosemary Rosmarinus officinalis

Rudbeckia Rudbeckia

Rupturewort Herniaria

Russian sage Perovskia atriplicifolia

salvia Salvia

Silver mound


snow in summer Cerastium tomentosum

speedwell Veronica

St. John's wort

statice Limonium leptostachyum

Stawberry (Beach) Fragaria chiloensis

stoke's aster Stokesia laevis

stonecrop Sedum

sun flower Helianthus

sundrop Oenothera macrocarpa

sweet alyssum Alyssum

sweet pea Lathyrus odoratus

Sweet sultan

sweet william Dianthus barbatus


tulip Tulipa

verbena Verbena

Wire plant

Wirevine (Creeping)

Yarrow Achillea millefolium

zinnia Zinnia


Abelia (Edward Goucher) Abelia x grandiflora 'Edward Goucher'

Abelia Glossy

Acacia (Abyssinica) Acacia abyssinica

Acacia (Prostrate) Acacia redolens

Acacia (Shoestring) Acacia stenophylla

Andromeda (Japanese)

Arborvitae (American)

Arborvitae (Aureus nana-dwarf golden)

Arborvitae (Emerald)

Arborvitae (Globosa-globe)

Arborvitae (Little giant-dwarf)

Arborvitae (Minima glauca-dwarf)

Arborvitae (Nigra-dark American) Thuja occidentalis

Arborvitae (Pyramidalis-pyramid) Thuja occidentalis 'Pyramidalis'

Arborvitae (Rheingold) Thuja occidentalis 'Rheingold'

Arborvitae (Techny) Thuja occidentalis 'Techny'

azalea Rhododendron

Bamboo (Compacta-dwarf)

Bamboo (Harbour dwarf-heavenly)

Bamboo (Nana purpurea-heavenly)

Bamboo (Nana-compacta-heavenly)

Bamboo (Woods dwarf heavenly)

Barberry (Atropurea-redleaf Japanese) Berberis thunbergii 'Atropurpurea'

Barberry (Aurea-golden Japanese) Berberis thunbergii 'Aurea'

Barberry (Crimson pygmy)

Barberry (Mento)

Barberry (Rose glow) Berberis thunbergii var. atropurpurea 'Rose Glow'

barberry Berberis thunbergii

barberry Mahonia repens

Berberis x gladwynensis 'William Penn'

bottlebrush Callistemon pallidus

Bougainvillea (Barbara Karst) Bougainvillea 'Barbara Karst'

Bougainvillea (California Gold) Bougainvillea 'California Gold'

Bougainvillea (Pink pixie) Bougainvillea 'Pink Pixie'

Bougainvillea (Scarlett O'Hara) Bougainvillea 'Scarlett O'Hara'

Bougainvillea (Temple fire) Bougainvillea 'Temple Fire'

Bougainvillea (Texas dawn) Bougainvillea 'Texas Dawn'

Boxwood (Common) Buxus sempervirens

Boxwood (Harlands) Buxus harlandii

Boxwood (Japanese) Buxus microphylla japonica

Boxwood (Korean) Buxus microphylla koreana

boxwood Buxus microphylla

Broom (Hollandia-warminster)

Broom (Lena-Scotch) Cytisus scoparius 'Lena'

Camellia (Japanese)

camellia Camellia sasanqua

Cassia (Feathery)

century plant Agave americana

Cherry (Dwarf pink flowering almond)

Cleyera (Japanese)

coton easter Cotoneaster horizontalis

Cotoneaster (Himalayan)

Cotoneaster (Praecox-early)

Cotoneaster (Pyrenees)

Cotoneaster (Zabel)

cotoneaster Cotoneaster dammeri

cotton easter Cotoneaster

coyote bush Baccharis vanessae

Coyotebush (Kosteri)

Coyotebush (Nana-dwarf Japanese)

Coyotebush (Torulosa)

cranberry cotoneaster Cotoneaster apiculatus

crepe myrtle Lagerstroemia indica

Cypress (Filifera-thread)

Daphne (Fragrant)


Dogwood (Baileyi red osier)

Dogwood (Flaviramea-yellowtwig)

Dogwood (Sibirica-Siberian) Cornus alba 'Sibirica'

dogwood Cornus florida

elaeagnus Elaeagnus

Euonymus (Canadale)

Euonymus (Emerald'n gold) Euonymus fortunei 'Emerald & Gold'

Euonymus (Silver king)

Euonymus (Spreading)

Euonymus (Sunspot) Euonymus fortunei 'Sunspot'

Euonymus (Variegated Evergreen)

Euonymus (Wintercreeper)

euonymus Euonymus alata

euphorbia Euphorbia marginata

firethorn Pyracantha

forsythia Forsythia

Gardenia (August beauty)

Gardenia (Mystery)

Gardenia (Radican)

gardenia Gardenia

Hawthorn (India)

Heather (Cornish)

Heather (Mediterranean pink)

Heather (Purple bell)

Heather (Spring torch scotch)

Hibiscus (Ross Estey) Hibiscus rosa-sinensis 'Ross Estey'

hibiscus Hibiscus

hollies Ilex


honeysuckle Lonicera sempervirens

honeysuckle Tecoma capensis

hopseed bush Dodonaea viscosa

Jasmine (Asian)

jessamine Gelsemium sempervirens

juniper Juniperus


Laurel (American Cherry)

laurel cherry Prunus caroliniana

laurel Kalmia latifolia

Leaf (Copper)

Leaf (Lemon)

Leucothoe (Coast)

Leucothoe (Drooping)

Lilac (Wild)

lilac Syringa vulgaris

lilac Syringa X chinensis

lily of the valley Convallaria majalis

Lily-of-the-Valley (Forest flame)

Lily-of-the-Valley (Mountain fire)

Lily-of-the-Valley (Snowdrift)

Lily-of-the-Valley (Temple bells)

Lily-of-the-Valley (Valley rose)

Lily-of-the-Valley (Vally valentine)

Mahonia (Leather leaf)

maple (Amur) Acer ginnala

Maple (Coral bark Japanese)

Maple (Dwarf Japanese)

Maple (Japanese)

mock orange Philadelphus

nandina Nandina domestica

Oleander (Hardy red)

Oleander (Ruby lace)

Osmanthus (Fortunes)

Palm (Chinese fountain)

Palm (Christmas)

palm (Pygmy date) Phoenix roebelenii

palm (Sago) Cycas revoluta

palm Areca

photinia Photinia x fraseri

Pine (Mugo-mugho)

Pineapple guava

Pittosporum (Green)

Pittosporum (Japanese)

Pittsosporum (Wheeler's dwarf)


Plumbago (Dwarf)

potentilla Potentilla


Red cedar (Eastern)

Rhaphiolepis (Charisma-Monruce)

Rhaphiolepis (Enchantress-Moness)

Rhaphiolepis (Roundleaf)

Rhaphiolepis (Springtime-Monme)

rhododendron Rhododendron


Rose (Ramanas)

Rose of Sharon (Heart)

Rose of Sharon (Red bird)

Rose of Sharon (Woodbridge) Hibiscus syriacus 'Woodbridge'

rose of Sharon Hibiscus syriacus

rugosa Rosa

sakaki Cleyera japonica


Skimmia (Japanese) Skimmia japonica

Skimmia (Reeve's) Skimmia reevesiana

Smoke Tree (Coral beauty)

Smoke Tree (Royal purple) Cotinus coggygria 'Royal Purple'

smoke tree Cotinus

Spiraea (Anthony Waterer)

Spiraea (Bridal wreath) Spiraea prunifolia

Spiraea (Dolchia)

Spiraea (False)

Spiraea (Japanese alpine)

Spiraea (Shirobana)

Spiraea (Vanhoutte)

Spurge (Japanese) Pachysandra terminalis

Sumac (African)


Sweetgum (American)

Sweetspire (Henry Garnet holly leaf)

viburnum Viburnum

wax myrtle Myrica cerifera

weeping bottlebrush Callistemon viminalis

weigela Weigela

Woadwaxen Genista tinctoria

Woodbine (Flowering)

Woodbine (Serotina)

Xylosma Xylosma

Yew (Anglojap)

Yew (Plum)

Yew (Upright Japanese)


yucca Yucca


American sycamore Platanus occidentalis

ash (Shamel) Fraxinus uhdei

ash (White) Fraxinus americana

baldcypress Taxodium distichum

birch (European white) Betula pendula

birch (Paper) Betula papyrifera

birch (River) Betula nigra

Blackgum Nyssa sylvatica

Bottle tree

carrotwood Cupaniopsis anacardioides

Cherry (Yoshino flowering)

Coolibah tree

cottonwood Populus deltoides

cypress (Arizona) Cupressus arizonica

Cypress (Filicoides-fernspray) Chamaecyparis obtusa 'Filicoides'

Cypress (Gracilis-slender Hinoki) Chamaecyparis obtusa 'Gracilis'

Cypress (Swara false)


Dogwood (Cloud nine) Cornus florida 'Cloud Nine'

Douglas fir Pseudotsuga menziesii

eastern cedar Juniperus virginiana

eastern white pine Pinus strobus

elm Ulmus parvifolia

Eucalyptus (Mealy)

eucalyptus (Red ironbark) Eucalyptus sideroxylon

Eucalyptus (Redgum)

Eucalyptus (Silver dollar) Eucalyptus cinerea

Ficus (Mini)


Fir (Balsam)

fir (White) Abies concolor

florida anise-tree Illicium floridanum

ginkgo Ginkgo biloba

hawthorn Crataegus viridis

hemlock (Eastern) Tsuga canadensis

Honey locust (Shademaster) Gleditsia triacanthos inermis 'Shademaster'

Honey locust Gleditsia triacanthos

Korean dogwood Cornus kousa

larch Larix kaempferi


loblolly pine Pinus taeda

locust (Black) Robinia pseudoacacia

magnolia Magnolia


Maple (Albus-flowering)

Maple (Flame)

Maple (Luteus-flowering) Abutilon 'Luteus'

maple (Norway) Acer platanoides

Maple (Red Sunset)

maple (Red) Acer rubrum

Maple (Roseus-flowering) Abutilon 'Roseus'

maple (Silver) Acer saccharinum

maple (Sugar) Acer saccharum

Maple (Tangerine-flowering) Abutilon hybridum 'Tangerine'

Maple (Vesuvius red-flowering) Abutilon hybridum 'Vesuvius Red'

Mesquite (Chilean) Prosopis chilensis

oak (Bear) Quercus ilicifolia

oak (Pin) Quercus palustris

Oak (Red) Quercus rubra

oak (Scarlet) Quercus coccinea

oak (Southern live) Quercus virginiana

oak (Willow) Quercus phellos

oak Quercus phellos

Palm (Mexican fan) Washingtonia robusta

palm (Parlor) Chamaedorea elegans

palm (Queen) Syagrus romanzoffiana

pine (Austrian) Pinus nigra

Pine (Bosnian)

pine (bristlecone) Pinus aristata

pine (Canary Island) Pinus canariensis

Pine (Columnar Scotch) Pinus sylvestris 'Fastigiata'

Pine (Eldarica)

Pine (Japanese black) Pinus thunbergiana

pine (Loblolly Pinus radiata

pine (Lodgepole) Pinus contorta var. contorta

Pine (Pumillo-shrubby swiss mountain)

pine (Red) Pinus resinosa

pine (Shore) Pinus contorta

planetree Platanus acerifolia


redbud Cercis canadensis

Russian olive Elaeagnus angustifolia

Scotch pine Pinus sylvestris

sequoia Sequoiadendron giganteum

sourwood Oxydendrum arboreum

Spruce (Colorado) Picea pungens

Spruce (Dwarf Alberta) Picea glauca 'Conica'

Spruce (Dwarf globe blue)

Spruce (Glauca-Colorado blue) Picea pungens 'Glauca'

Spruce (Hoopsii-Hoop's blue) Picea pungens 'Hoopsii'

Spruce (Koster-Koster blue) Picea pungens 'Koster'

spruce (Norway) Picea abies

Spruce (Pendula-weeping Norway) Picea abies 'Pendula'

Spruce (Repens-spreading Norway) Picea abies 'Repens'

spruce (White) Picea glauca

sycamore Platanus racemosa

Tab (Yellow)

toyon Heteromeles arbutifolia

tuliptree Liriodendron tulipifera

willow Salix

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

Almond Prunus dulcis


apricot Prunus armeniaca



Blueberry Vaccinium


cherry Prunus avium

cherry Prunus cerasus


crabapple Malus







Grape (American)

Grape (European)

grapefruit Citrus paradisi

kiwi Actinidia chinensis

lemon Citrus limon

loganberry Rubus loganobaccus

macadamia Macadamia integrifolia

nectarine Prunus persica var. nucipersica

Olive (Black)

olive Olea europaea

orange Citrus sinensis

peach Prunus persica

pear Pyrus

pecan Carya illinoinensis

pistachio Pistacia vera

plum Prunus

pomegranate Punica granatum


raspberry Rubus

raspberry Rubus glaucus

tangelo Citrus X tangelo

tangerine Citrus reticulata

walnut Juglans nigra

walnut Juglans regia

White mulberry Morus alba

Fruits, Vegetables & Herbs

Asparagus Asparagus officinalis

Broccoli Brassica oleracea var. botrytis

Brussels sprouts Brassica oleracea var. gemmifera

Cabbage Brassica oleracea

Cantalope Cucumis melo



Celery Apium



Eggplant Solanum melongena



Lima beans

Mustard greens

Okra Abelmoschus esculentus


Peas (Black-eyed)

Peas (Field)

Peas (Green)

Peppers Piperaceae


radish Raphanus sativus

Snap beans

Southern peas (Cow peas)

Tomatoes Lycopersicon

Turnip greens

Watermelon Citrullus lanatus