After roots have accumulated sufficient copper sulfate the roots will die and begin to decay and water flow will increase. As the roots re-grow, follow-up treatments will be required.
Applications may be made twice a year in the spring after plant growth begins, and during late summer or early fall, or any time a reduced water flow, thought to be caused by root growth, occurs. Instant Power Root Destroyer uses the largest copper sulfate crystals available for longer lasting results.
* Copper sulfate based products cannot be sold or used in Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano and Sonoma counties of California or the state of Connecticut.