Copper sulfates on tree roots and why they work #3
Description
Tree roots in contact with or immersed in copper sulfate solution absorb copper for a short distance into the root system. Use of this treatment has yet to cause the loss of a tree or shrub. Apparently the absorbative function of the roots is destroyed before toxic copper travels very far.
It can take as little as two or three days to clear out the line. However, if your system has a slower flow of water, it can take a bit longer (up to a week) to get rid of the roots. By contrast, copper sulfate takes up to four weeks to even start the process of root decay.