and tested on potted plant roots part of the pot container was cut out at the base so that the roots could be seen the exposed roots were dosed with the foam mixtures and observed the plants were also watered and the foam was dipped in water to see how much would wash off the plants used were hibiscus species and the effects of the foaming root killer were readily identified by the blackening of the roots along the length inward beginning at the meristems dead roots were identified visually by the loss of root hairs within 72 hours and subsequent decomposition on treated roots vs untreated roots root kill was typically 1 2 inches from the applied foam after 2 weeks no new root growth was observed in the treated areas and significant foam residue was clearly visible when the 2 parts of the formula are brought together a small amount of foaming ensues yielding a thick sticky paste that does not run off or down target surfaces when water is added to the mix the mass is diluted and some of the mix will run down roots and pipes to the bottom the greater the water dilution the runnier the mix becomes however even large dilutions with significant run off still leaves behind a thin sticky film which bonds to the roots and pipes the dichlobenil and sulfamate salts from the foam mixture are believed to be absorbed into the root tissues thereby killing them after death regrowth of roots into the line later is inhibited by the action of the dichlobenil on the meristems.