About 9 a.m. I sprayed an area of mulch that was thick with stinkhorns with a hose-end sprayer of mole-repellent. By 1 p.m. all the stinkhorns had shriveled almost completely. The brand name was Sweeney's and the label active ingredient was 100% Castor Oil. It's been pretty effective against the moles when I use it about every month. The results on the stinkhorns was really dramatic however.