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Season-Long Weed Preventer

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  • Controls crabgrass before and after it emerges! Up to the third leaf stage.
  • Contains Dimension® to prevent crabgrass without any fertilizer
  • Safe to use near flower beds and around 100+ ornamental plants
Real Season-Long Lawns®
Product Overview
Jonathan Green Season-Long Weed Preventer for lawns and landscapes contains Dimension®, a clear and odorless chemical that kills and prevents crabgrass both before and after it germinates (up to the 3rd leaf stage). At maturity crabgrass is a 7-leaf plant. Dimension® also stops more than 30 other grassy and broadleaf weeds from invading the lawn and garden beds if applied before the weeds germinate. The weed control lasts for the entire growing season.

Crabgrass seeds germinate over many months, so if crabgrass has been a persistent problem, apply this product again in late-May to mid-June to stop these late germinating seeds from establishing. The easy-to-spread granules are great to use to prevent weeds from growing around more than 100+ ornamental plants, all of which are listed on the product label.
Coverage Guide


Coverage Amount
10 lb.
Up to 5,000 sq. ft.
30 lb.
Up to 15,000 sq. ft.
How Do I Calculate My Lawn Size? First measure the length and width of your lawn. Then multiply the length by the width and deduct the square footage of any non-lawn areas (landscape bed, patio, deck, pool, etc.) from the total. Now you know how much product you need to purchase!
Shipping & Returns


  • Free ground shipping now available on orders of $75 or more! For smaller orders, shipping costs are calculated at checkout.
  • We ship orders the same day if placed by 2PM EST (later orders will be shipped the next day).
  • Orders are not shipped or delivered on weekends or holidays.
  • We offer ground and expedited shipping.


  • We offer 30-day free returns for replacement or full refund for items that are damaged or defective (shipping included). If damaged by the carrier, please file a claim with them.
  • If your items have been used or aren’t in the original packaging, we will give you a refund (minus the cost of shipping) based on the condition of the product.

View our complete shipping and return policy. If you have questions about your order, please contact our customer service team at orders@jonathangreen.com.

  • Controls crabgrass and controls or suppresses other listed grass and broadleaf weeds when applied prior to their germination. For the full list of weeds, please read the product label.

  • Dimension® (Dithiopyr)

  • Pre-emergent control of crabgrass and other listed weeds. Post-emergent control is limited to crabgrass only, up to the 3rd leaf stage of growth.

  • Apply to crabgrass before and for four weeks after germination. For all other broadleaf weeds listed on the label, apply before they germinate.


    Spread this product summer through mid-fall (late August through early November) to control poa annua and crabgrass. When spread in the fall a second subsequent application must be made the next spring.

    • Do not apply more than 4.3 lb of this product per 1,000 sq ft per application and no more than 12.9 lb of this product/1000 sq ft per year (equivalent to 0.5 and 1.5 lb of active ingredient per acre, respectively).
    • In the state of New York, do not exceed 2.1 lb per 1000 sq ft per year of this product (equivalent to 0.25 lb of active ingredient per acre).
    • Apply once in the early spring and again by the end of May as one application lasts 3 – 4 months. This will cover the entire crabgrass growing season.
    • For winter annuals such as Poa Annua and Chickweed, apply again when soil temperatures drop to 70°F in the late summer.
  • No

    • After applying Season-Long Weed Preventer – wait 90 days to plant grass seed
    • After seeding – wait 60 days to apply Season-Long Weed Preventer
  • We don’t recommend applying two of our weed controls or fertilizers together, as you risk burning your lawn. You can, however, apply two of these products together if one has fertilizer and the other one doesn’t. The rule of thumb is: if two products have different functions, it is usually possible to apply them together.

  • Apply to a dry lawn

  • We recommend waiting at least 24 hours for people and pets to enter the treated area after application to allow the product to activate. After applying Season-Long Preventer, water your lawn to move the fertilizer to the roots. Once the grass has dried, people and pets are safe to re-enter the lawn area.


    Follow all label directions for products that contain pesticide controls for re-entry instructions. All control products have been screened by the Federal Environmental Protection Agency (EPA) and are properly labeled for use on lawns or gardens. Please read and follow all label directions.

  • Our recommendations for storing your weed control:


    Place it in a cool dry place, off of the ground, out of direct sunlight, and keep it away from moisture. Keep bags (especially that have already been opened) containing unused product in a locked storage area inaccessible to children and pets Do not store near feed or foodstuffs.


    To prevent cross-contamination, do not store near open containers of fertilizer, seed or other pesticides. Under these conditions, weed controls will last at least two years.

    • Carefully read all instructions prior to application
    • Avoid contact with eyes or clothing
    • This product is toxic to fish. Drift and runoff may adversely affect aquatic organisms. Do not apply directly to water, or to areas where surface water is present, or to intertidal areas below the mean high water mark. Do not contaminate water when disposing of equipment washwaters
    • Wash hands thoroughly with soap and water after handling and before eating or drinking
    • Do not apply if heavy rain is expected.
    • Apply this product only to your lawn or garden and sweep any product that lands on the driveway, sidewalk or street back onto your lawn or garden.
    • Not for use on turf being grown for sale or other commercial use as sod, or for commercial seed production, or for research purposes.
    • Not for use on plants being grown for sale or other commercial use, or for commercial seed production, or for research purposes.
    • Do not use clippings from treated turf for mulching around vegetables or fruit trees.
  • Always read and follow the product label before use.




    Safety Data Sheets can be found at www.jonathangreen.com/safety-data-sheets-sds. If you have a specific question, do not hesitate to contact us.


spreader product


spreader product


spreader product


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Step 1/4

Who makes your spreader?

Jonathan GreenScottsAgri-FabChapinCycloneEarthway / AmesEchoLescoOrthoPrecision / Red DevilRepublic / EZSta-GreenVigoro

Don’t see your spreader here? Contact the manufacturer or review your spreader’s manual.


Step 2/4

What type of spreader are you using?

Rotary Drop Handheld


Step 3/4

What is the model of your spreader?

Agri-Fab Push Broadcast Agri-Fab Drop 81000A Cyclone Rotary EV-N-SPRED® Broadcast Earthway Rotary Ames Broadcast Earthway Drop Echo RB 60 Standard Deluxe and Pro Hand Spreader Lesco Numbered Lesco Lettered Ortho Rotary Ortho Drop Precision Rotary Red Devil Rotary Precision Drop Red Devil Drop EZ Broadcast EZ Drop All Rotary Turf Builder Classic AccuGreen 2000-3000 AccuGreen 1000 Wizz Rotary

Don’t see your spreader model here? Contact the manufacturer or review your spreader’s manual.


Step 4/4

Select the rate that best suits your lawn needs.

Depending on the type of product you selected there may only be one application rate.

Regular Rate - 1.9 lb per 1000 sq ft

Note: “New lawn” indicates that you are starting a lawn from bare dirt vs overseeding or applying product to an existing lawn.


Season-Long Weed Preventer

Your Spreader Setting is:

Start over
  • What is the difference between Veri-Green with Crabgrass Preventer and Season-Long Weed Preventer?

    Veri-Green Crabgrass Preventer plus Lawn Fertilizer is a 2-in-1 product that kills crabgrass and fertilizes the lawn. This product acts as a pre-emergent for broadleaf weeds and a pre-and post-emergent for grassy weeds like crabgrass (up to the 3-leaf stage). Do not seed with this product as it will kill your grass seedlings.


    Season-Long Weed Preventer: This is a pre-emergent product for broadleaf weeds and a pre- and post-emergent for crabgrass. There is no fertilizer in this product so it can be applied in the heat of the summer. Do not seed with this product as it will kill your grass seedlings.


    For lawns with crabgrass issues, we advise applying Season-Long Weed Preventer in the beginning of June to lengthen the crabgrass prevention window of product applied in March or April. Because it has no fertilizer, it does not interfere with any other lawn application.

Features You’ll Love

If you’re tired of trying to get rid of crabgrass and weeds, you’re not alone. The good news is there’s an easy and effective way to prevent them from growing in the first place. Our Season-Long Weed Preventer stops the cycle so you can spend more time making memories and less time controlling weeds.

Prevents Both Grassy and Broadleaf Weeds

Save yourself the headaches that come with dealing with weeds and spend your time making memories instead. This amazing product controls annual grasses, like crabgrass, and broadleaf weeds, such as dandelions and chickweed.
Prevents Both Grassy and Broadleaf Weeds

Safe to Apply Throughout the Growing Season

Having a weed-free lawn in the summer is easier than ever! Because Season-Long Weed Preventer is free of fertilizer, there is no risk of burning your lawn in hot weather. Apply anytime from spring through fall to prevent weeds from emerging.
Safe to Apply Throughout the Growing Season

Stop the Cycle! Prevent Crabgrass from Germinating

A single crabgrass plant is capable of producing an astounding 150,000 seeds that can live in the soil for 3 years. The best way to rid your lawn of grassy weeds is with prevention. Use this product to prevent crabgrass seeds from germinating and kill any crabgrass in the lawn up to the third leaf stage.
Stop the Cycle! Prevent Crabgrass from Germinating

How to Apply


  • We recommend using a spreader to evenly distribute the product onto your lawn.
  • Check to make sure the spreader opening at the bottom of the hopper is closed.
  • Set the spreader according to the recommended setting on the packaging or use our Spreader Settings Tool above.
  • Apply around the perimeter of the lawn to establish a turning area. Then run the spreader back and forth within the area outlined by your first perimeter application. Always allow overlap to avoid gaps in coverage.
  • This product can also be used in flower and landscape beds if applied after the plants are established. Use a glove if spreading Season-Long Weed Control by hand.


  • Sweep any excess granules off of hard surfaces and back onto the lawn.
  • For best results, irrigate the treated area after application. About ½ inch of water is sufficient to activate the weed control.
  • Once watered, wait a day to mow the lawn allowing the product time to activate.
Season-Long Weed Preventer 5,000 sq. ft.
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