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.
The length of time Dimension 2EW Herbicide lasts depends on the rate used, it can last 3-6 months.
Dimension 2EW is one of our most popular pre-emergents for crabgrass as well as many other broadleaf weeds, and it can safely be used on St. Augustine grass. Please check the product label to ensure that it will control the other weeds that you are targeting.
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 2EW is safe for pets when used correctly. You would want to keep pets out of the treated area while you perform your application and allow it to dry completely. Once fully dry, it is safe for pets to re-enter the treated area.
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.
We would not recommend applying herbicides such as Dimension 2EW Herbicide during active precipitation. Instead, you could use a higher volume of water, or you could irrigate the application yourself with at least 1/2 inch of water.
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.
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.
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.
Pre-emergents like Dimension 2EW should be used before the weeds germinate in the fall time. We would recommend checking with a local master gardener in your area to give you an exact time. Here is the link:
http://www.csrees.usda.gov/Extension/
Please let us know if you have any additional questions.