RootShield PLUS is active from 48°F-97°F, going dormant at temperatures below 48°F. As spring temperatures warm and plants come out of winter dormancy, so do pathogens. RootShield PLUS will become active also and go to work right away. 

Prior to winter covering (atleast 2-4 weeks prior to covering): 

Thoroughly drench roots using a solution containing RootShield PLUS WP at a rate of 6 - 8 ozs. per 100 gallons or pot your perennials into a mix containing RootShield PLUS Granules incorporated at a rate of 1.5 - 2lbs per cubic yard.  

Chemical Compatibility:

RootShield PLUS is compatible with many chemical fungicides, insecticides, and plant growth regulators. RootShield PLUS Granules can be used as a stand-alone fungicide for root disease control or it may also be part of an existing disease management program. Learn More 

Fertilizer Compatibility:

RootShield PLUS Granules is compatible with all forms of fertilizers; RootShield PLUS WP can be tank-mixed with concentrated water soluble fertilizers for use through injectors. Note: constant agitation of RootShield PLUS WP is required; if mixing and applying with concentrated water soluble fertilizers, drench RootShield PLUS WP within one hour of suspension. Learn More