The label of Prowl H2O Herbicide states that it is safe for some warm season grasses including switchgrass. Please read over the product label for application instructions.
We recommend carefully reading the product label for Prowl H2O Herbicide and the MSMA product label you're intending to use to determine if the two products can be tank mixed and suitable for your application as MSMA is limited in where it can be applied. If so, it is also recommended to do a compatibility test first and apply the mixture to a small area before doing the entire application.
Prowl H2O Herbicide is labeled to kill Foxtail and its safe to use in Switchgrass. Please review the product label for mix rates and more information.
Prowl H2O Herbicide does not list any type of bluestem grasses on the label, so the product should not be applied to those grass types.
