Dimension 2EW Herbicide

Dimension 2EW Calculator [Application + Mix Rates]

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Written By: Mark Marino

a Massachusetts Core Applicator License holder and owner/operator of Lawn Phix,

Updated on

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Dimension 2EW is a great liquid pre-emergent herbicide option for grasses and broadleaf weeds, which makes it a popular herbicide for both established lawns and golf courses. It provides excellent pre-emergent control of crabgrass and other annual grassy weeds such as Poa Annua, Dallisgrass and Goosegrass. Dimension is also better than Prodiamine in controlling broadleaf weeds. Dimension 2EW is labeled for such weeds as Chickweed, Purslane, and Spurge.

Dimension can technically be used as a pre emergent and post emergent. The active ingredient in Dimension 2EW Specialty Herbicide is the herbicide Dithiopyr, which contains post emergent qualities that can kill crabgrass in its early stages.

The application rates for Dimension 2EW 0.367 – 0.73 oz. per gallon per 1,000 sq. ft. Do not apply more than 0.73 oz. of Dimension 2EW per 1,000 sq. ft. per application, and no more than 6 pints of Dimension 2EW per acre per year (2.2 fl oz per 1000 sq. ft). Use and bookmark this Dimension Calculator page to ensure you properly calculate the mix ratios of Dimension 2EW for your lawn every time. 

While the price tag of $146 for 64 ounces* may seem daunting, the upfront cost is justified when it’s broken down per 1,000 sq. ft. – just $1.66 per 1,000 sq. ft.

Example: a 10,000 sq. ft. lawn would be at $33.20 for a full split application (two apps, three months apart, and just under 15 total fl. oz.). On top of this cheap season-long coverage, this 64 oz. container of Dimension 2EW herbicide would cover this cool season for 4 years of pre-emergence control. 

After spraying Dimension 2EW herbicide, water in with 1/2″ of irrigation or rainfall within 6 hours of application. For post emergent herbicide control, wait a minimum of 6 hours before watering. 

Dimension plays a pivotal role in preventing and controlling crabgrass. Know exactly when to apply crabgrass preventer. For best coverage, apply Prodiamine in early Spring (Round 1) and apply Dimension 2EW (Dithiopyr) later in the season – about 8 weeks after Round 1. 

Dimension 2EW FAQs

How soon can I seed after applying Dimension 2EW Herbicide?

You need to wait 3-4 months before seeding after applying Dimension.

How to apply dimension herbicide?

The best time to apply Dimension 2EW is in late spring and early summer as your second (and third) pre-emergent application. Dimension (dithiopyr) has some post emergent effects and can kill and control young crabgrass – something which Prodiamine (barricade) cannot.

How do you mix Dimension 2EW herbicide?

Fill a clean tank with water to approximately half of the desired level. Add the recommended amount of Dimension 2EW to the tank. Fill the tank with the rest of the water and agitate to ensure that the herbicide is fully suspended in the tank.

What is the Dimension 2EW mixing rate per gallon?

The mix ratio for Dimension 2EW is between 0.367-0.73 fluid ounces (fl. oz.) Do not use more than 0.73 fl. oz. of Dimension per 1,000 sq. ft. per application. Do not exceed the annual maximum rates of 2.2 ounces of Dimension 2EW per 1,000 sq. ft. (6 pints per acre).

How to apply dimension herbicide?

Apply Dimension 2EW in a backpack sprayer, handheld sprayer or tank mix. Use at least 0.5 gallons of water per 1,000 sq. ft. and spray evenly across the turf. For pre-emergent control, water in with 0.5″ of rainfall or water immediately after application. For post emergent control, delay watering for a minimum of 6 hours.

Author's Note: this piece has been updated for accuracy since its first publication on
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Author: Mark Marino
My name is Mark Marino, and I am the founder, owner, and operator of Lawn Phix. With a passion for lawn care and turf nutrition for over a decade, I've dedicated countless hours to correcting soil and perfecting lawns. Today, my expertise, backed by formal courses at UMass Extension Pesticide Education, allows me to offer top-tier lawn care services and advice. I am a fully licensed and insured lawn care applicator in Massachusetts, specializing in comprehensive turf nutrition, weed control, and lawn pest control. My license number is AL-0053865. Contact me at [email protected] or +1 (508) 500-8402.