Preen® One Lawncare™

Preen One Lawncare is rated 4.6 out of 5 by 142.
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Preen® One Lawncare™ delivers three essential lawn treatments in one easy step. First, it stops crabgrass and other lawn weeds of its type from growing all season long. It stops the seeds. It gets the seedlings. Second, it tackles and kills 250 of the toughest broadleaf lawn weeds, including dandelions. It kills them down to the roots. And third, it feeds the lawn for 8 weeks. 

Typical weed and feed products don’t prevent crabgrass. Another product is required. Preen One Lawncare does it all! Weed, feed and crabgrass control in one easy spring application.

Plus, Preen One Lawncare can be used on both cool season and warm season grasses!

This three-in-one product kills and controls many of the toughest weeds that can choke a lawn.  Apply Preen One Lawncare in spring or in fall for guaranteed control of 250 types of common, aggressive weeds that plague homeowners coast-to-coast, including: crabgrass, dandelion, annual bluegrass, marestail/horseweed, foxtail, chickweed, clover, creeping Charlie/ground ivy, dock, henbit, nettle, plantain, purslane, prostrate knotweed, cinquefoil, spurge, woodsorrel, and more. Preen One Lawncare also knocks out such regional bullies as: dallisgrass, Virginia buttonweed, dollarweed, cudweed, English daisy, wild garlic, wild onion, wild violet and more.

With Preen One Lawncare, you can spend more time enjoying your lawn and less time working on it. And you’ll love how your lawn will look.

Previously called Preen Lawn StepSaver®

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How to Apply

For optimum weed control in lawns, apply Preen® One Lawncare™ to grass when the lawn is wet from rain, dew or sprinkling, as this product needs to stick to the leaves of broadleaf weeds. The lawn should not be watered or disturbed for at least 24 hours after application.

For best results, we recommend that you:

  • apply when no rain is expected in the next 24 to 48 hours – preferably 48 hours,
  • not mow the area to be treated for 3 days before application and 3 days after application,
  • apply to a wet lawn (for example, wet from morning dew, irrigation or recent rain)
  • do not irrigate the treated area after application for 24 to 48 hours – preferably 48 hours.

Apply this product when the wind is calm. Do not apply this product onto desirable plants or shrubs as damage may result. If the product gets onto other plants immediately brush or wash it off the foliage.

Use a drop or rotary spreader designed to apply granular fertilizers. Uniform coverage is essential for best results. It should take approximately 2 to 4 weeks to see the label-listed broadleaf weeds succumb.

When to Apply

Preen One Lawncare can be used either in the spring or fall. Apply the product when grass and weeds are actively growing under adequate soil moisture and favorable temperatures (50°F to 80°F). Do not apply under drought conditions.

In the spring, the ideal time to apply Preen One Lawncare is after the forsythia has bloomed or when the first dandelion flowers appear. For full weed control in lawns in southern areas, make a second application in 6 to 8 weeks for best weed and crabgrass control and for full season fertilization. In the fall, apply Preen One Lawncare when the weather cools and both the grass and weeds are actively growing, generally around Labor Day.

For established lawns, apply Preen One Lawncare when broadleaf weeds are actively growing and prior to germination or tilling of annual grasses. It may be applied as a single application or as a split application in spring, summer or fall.

You can reseed or overseed a lawn treated with Preen One Lawncare 10 weeks after application. 

If the lawn has been seeded recently, wait until after the third mowing before using this product.

Do Not Use

This product is not for use:

  • on dichondra, carpetgrass, colonial bentgrass or turf mixes including desirable clovers, or St. Augustinegrass in Florida
  • within 25 feet of open water including rivers, streams, fish ponds, lakes and marshes,
  • where it can enter or wash into storm drains or drainage ditches
  • where the water table is shallow and soils are permeable, near wells or cisterns.
  • within the drip line of desirable trees and shrubs.

Note: Do not use clippings of treated grass as mulch or in compost piles.

This is not the product label. Always read and follow directions on the product label. Use only as directed.

Weeds Controlled

Available Sizes


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Rated 1 out of 5 by from I am so disappointed. I'm so disappointed, I put this down 2 weeks ago and I haven't seen anything happen. I don't know how long it takes but not one weed is dying and grass has not changed
Date published: 2019-04-14
Rated 3 out of 5 by from Just wondering I bought this but haven’t applied it yet. Can it be used if nights are still below 40s or 50s? Also, will this kill creeping Charlie, which is my big problem. Unable to accurately rate until I see how it performs.
Date published: 2019-04-10
Rated 5 out of 5 by from Amazing for my lawn Bought this last year for my yard and grass did an amazing job will be buying again this year for my lawn if your looking for something make your yard n lawn look great this product is it I am not what they call green thumb but this product was amazing
Date published: 2019-03-11
Rated 5 out of 5 by from Great product! I received this product and was recommended to try it to help with a new place we just bought. We started in the back of the house where our sprinkler system is at and started spraying away. I love how it is easy to hold and the sprayer was easy to use especially for people with arthritis like myself. We let it sit a good bit and went back to check and it started working and the weeds looked wilted and was very pleased to see the outcome. Now, we have sprayed all over our property and we are very happy with the PreenOne Lawncare and will stock up for the future seasons.
Date published: 2018-07-16
Rated 4 out of 5 by from Preen does it again Got the preen one bag just before everything started to grow so I wanted to wait and let things take off like the directions say. Applied the morning after a good rain so the lawn was damp with a broadcast spreader. It seems to have taken care of most varieties of weeds that were present and lawn has that dark green color that you love to see! Curious to see how long before the need to reapply.
Date published: 2018-06-08
Rated 3 out of 5 by from I had high hopes. 2nd 8wk application killed grass I reseeded my lawn by the book last fall (Oct 17) using a slit seeder and Titan Tall fescue seed. By March/April my grass was amazing, the best in the neighborhood. Thick green and lush! I applied Preen One in March ( I am in Charlotte NC) to take advantage of its pre-emergent as well as existing weed control. The few weeds that I had were gone within a couple of weeks and the grass looked great. I had to mow it twice a week. Then 8 wks later I applied Preen one again, as recommended, and as directed. Within two weeks large patches of my grass were turning brown. Now it looks terrible. We have had plenty of rain, and I cannot fathom any other reason for the dead grass. I am very disappointed after spending so much time and money this year to finally have a great lawn.
Date published: 2018-06-08
Rated 4 out of 5 by from Great Product! I applied this product to my back yard and the results were great! Dandilions were killed and my lawn is very green and healthy! I'd highly recommend this to anyone and I will also be buying more to use on my front lawn!
Date published: 2018-06-05
Rated 2 out of 5 by from Easy to spread but not too effective I received preen a month ago to try for free. I spread it all over my lawn. I spread extra preen in the spots where I knew weeds would come in. I saw weeds in certain spots and it grew after I applied preen. I wasn't impressed with the product.
Date published: 2018-05-24
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