The length of time Dimension 2EW Herbicide lasts depends on the rate used, it can last 3-6 months.
Dimension 2EW Herbicide can stay in the soil for up to 6-8 months depending on the application rate. Once the area is dry you will not track it into the house since you need to water in ½ inch after application so that it gets into the soil to create a barrier.
Yes, Dimension 2EW Herbicide is labeled safe to use on Bahiagrass.
Dimension 2EW Herbicide should not be applied around edible trees/orchards. We recommend consulting with your local Master Gardener for a product that can be applied safely for pre-emergent control.
Dimension 2 EW is safe to apply to St Augustine grass. We would not recommend applying to turf that is stressed by heat, frost, or drought. We would also recommend split applications. Please see the rate table on page 5 of the product label for recommended rates for your area.
You will need to wait 3 months after applying Dimension 2EW Herbicide to reseed. Or, you can reseed and after you get good growth and have mowed the new grass a minimum of two times you can then do an application of Dimension 2EW Herbicide.
Dimension 2EW Herbicide will stay in the soil up to two years. It will be unsafe for the animals to graze until after the Dimension has left the soil.
In Arizona, you would generally make two applications of Dimension 2EW Herbicide 5 to 10 weeks apart. We would recommend the Program 2 or 3 rates of 1 oz per 1,000 sq ft and then 1.5 oz per 1,000 sq ft, or 2 applications of 1 oz per 1,000 sq ft each, according to the product label. Be sure that you immediately water-in the application with a high volume of water any time there is a barrier like gravel over the ground. This will help get more of the active ingredient down to the soil so that it is not just absorbed into the rocks before it can reach the dirt. (Since this product is still intended to be used around turfgrass and ornamentals, you may not get the same results on a stone area.) At the 1 oz,1000 sq ft rate, you would use 0.22 oz of Dimension 2EW in 1 gallon in your sprayer to cover 220 sq ft.
We would recommend Dimension 2EW for pre-emergent control but also consulting with your local extension office in your county for advisement on a fertilizer and weed control program.
Fertilome Weed Free Zone is a great post emergent broadleaf herbicide that is labeled for oxalis, black medic, burclover, and dozens of other broad weeds.
Whether oryzalin or dithiopyr is the best choice for you will depend on what weeds you are targeting, where you need to apply the product, and what price point you are wanting. Dithiopyr, which is the active ingredient in Dimension 2EW Herbicide, is the preferred pre-emergent for crabgrass and also covers a variety of other grassy and broadleaf weeds. Dimension also has the unique quality of offering early post-emergent control of crabgrass. Oryzalin (Surflan) is economical and can be used in some areas where Dimension may not be able to be used. Always be sure to check the product labels for whether the product you want to use is appropriate for your needs and safe to use around your target areas. Please let us know if we can further assist you.
The program that is chosen will depend on how long Dimension 2EW Herbcide lasts in the soil. For example, if Program 1 is done, it will provide 3-5 months of pre-emergent control. Most pre-emergent products will have to be applied at least twice a year to prevent Spring and Summer weeds.
For long term control though, you should apply a pre-emergent in the late fall and early spring which will prevent new crabgrass from coming up next year. If you apply pre-emergent every year, you should not have issues with crabgrass long term. Dimension 2EW is one of our most popular pre-emergents for crabgrass.
Dimension 2EW is labeled to control poa annua (annual bluegrass) before it emerges and should do a good job when applied at the right time. Please refer to the product label for complete instructions. If you are already dealing with Poa Annua, you will need to use a post-emergent, and we do carry several. Which you choose depends on your grass type. Certainty is a good choice, but please refer to the label to ensure it can be used on your lawn type.
Dimension 2 EW and Pendimethalin are labeled to prevent many of the same weeds, so we would recommend choosing the product that best fits your needs rather than making unnecessary applications. If you have specific questions about which pre-emergent would be best for your situation, you may reach our Customer Service team at 866-581-7378 M-F 9a-5p.