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).
- annual bluegrass (Poa annua), annual bursage (Ambrosia acanthicarpa), annual ryegrass (Lolium multiflorum), annual sowthistle (Sonchus oleraceus), Australian waterbuttons (Cotula australis), barnyardgrass (Echinochloa crus-galli)
- bittercress (Cardamine oligosperma), black medick (Medicago lupulina), black mustard (Brassica nigra), black nightshade (Solanum nigrum), bristly oxtongue (Picris echioides), broadleaf plantain (Plantago major), buckhorn plantain (Plantago lanceolata), burning nettle (Urtica urens), burnweed (Erechtites hieracifolia), California burclover (Medicago polymorpha), Carolina geranium (Geranium carolinianum), carpetweed (Mollugo verticillata)
- chamber bitter (Phyllanthus urinaria), cheat (Bromus secalinus), cheeseweed mallow (Malva parviflora), coast fiddleneck (Amsinckia intermedia), common chickweed (Stellaria media), common groundsel (Senecio vulgaris)
- common lambsquarters (Chenopodium album), common pokeweed (Phytolacca americana), common purslane (Portulaca oleracea), common ragweed (Ambrosia artemisiifolia), crabgrass (Digitaria)
- creeping woodsorrel (Oxalis corniculata), curly dock (Rumex crispus), dandelion (Taraxacum officinale)
- datura (Datura), desert rockpurslane (Calandrinia ciliata), dogfennel (Eupatorium capillifolium), dwarf horseweed (Conyza ramosissima), eclipta (Eclipta prostrata), eveningprimrose (Oenothera), fall panicum (Panicum dichotomiflorum), field bindweed (Convolvulus arvensis), field sandbur (Cenchrus incertus)
- Florida pusley (Richardia scabra), giant foxtail (Setaria faberi), goosegrass (Eleusine indica), green tansymustard (Descurainia pinnata), hairy bittercress (Cardamine hirsuta), hairy fleabane (Conyza bonariensis)
- hare barley (Hordeum leporinum), Heath aster (Aster ericoides), henbit (Lamium amplexicaule), honeyvine milkweed (Ampelamus albidus), horseweed (Conyza canadensis), hyssopleaf sandmat (Euphorbia hyssopifolia)
- Indian mustard (Brassica juncea), Ivyleaf morningglory (Ipomoea hederacea), jimsonweed (Datura stramonium)
- Johnsongrass (Sorghum halepense), junglerice (Echinochloa colona), kochia (Kochia scoparia), ladysthumb (Polygonum persicaria), lanceleaf groundcherry (Physalis lanceifolia), large crabgrass (Digitaria sanguinalis), largebracted plantain (Plantago aristata), London rocket (Sisymbrium irio), long-stalk phyllanthus (Phyllanthus tenellus)
- lovegrass (Eragrostis), Low mallow (Malva rotundifolia), Marestail (Hippuris vulgaris), mayweed (Anthemis cotula)
- Mexican sprangletop (Leptochloa uninervia), mouseear chickweed (Cerastium vulgatum), musk thistle (Carduus nutans)
- nettleleaf goosefoot (Chenopodium murale), Pennsylvania smartweed (Polygonum pensylvanicum), pennywort (Hydrocotyle spp.), petty spurge (Euphorbia peplus)
- pigweed (Amaranthus), pineappleweed (Matricaria matricarioides), prickly lettuce (Lactuca serriola)
- prickly sida (Sida spinosa), prostrate knotweed (Polygonum aviculare), prostrate spurge (Euphorbia humistrata)
- purple cudweed (Gnaphalium purpureum), purslane speedwell (Veronica peregrina), rattail fescue (Vulpia myuros)
- red sorrel (Rumex acetosella), redmaids rockpurslane (Calandrinia ciliata var. menziesii), redstem filaree (Erodium cicutarium), Russian thistle (Salsola iberica), scarlet pimpernel (Anagallis arvensis ssp. arvensis), Shaggy, soldier (Galinsoga ciliata), shattercane (Sorghum bicolor), shepherdspurse (Capsella bursa-pastoris), sibara (Sibara virginica)
- signalgrass (Brachiaria spp.), silversheath knotweed (Polygonum argyrocoleon), slender aster (Aster exilis), slender plantain (Plantago elongata), smooth crabgrass (Digitaria ischaemum), southern crabgrass (Digitaria ciliaris)
- southwestern cupgrass (Eriochloa gracilis), spiny sowthistle (Sonchus asper), spotted spurge (Euphorbia maculata)
- stinging nettle (Urtica dioica), stink grass (Eragrostis cilianensis), sunflower (Helianthus spp.), swinecress (Coronopus didymus), tall morningglory (Ipomoea purpurea), telegraphplant (Heterotheca grandiflora), Texas signalgrass (Panicum texanum), thymeleaf speedwell (Veronica serpyllifolia), turkey mullein (Eremocarpus setigerus)
- velvetleaf (Abutilon theophrasti), Venice mallow (Hibiscus trionum), Virginia pepperweed (Lepidium virginicum var. virginicum), white clover (Trifolium repens), whitestem filaree (Erodium moschatum), wild carrot (Daucus carota)
- wild mustard (Sinapis arvensis), wild oat (Avena fatua), wild radish (Raphanus raphanistrum), willowweed panicle (Epilobium), witchgrass (Panicum capillare), yellow foxtail (Setaria glauca), yellow sweetclover (Melilotus officinalis), yellow woodsorrel (Oxalis stricta)