Hi - Just wanted you to know that for at least the past 4 years in a row I have had severe poison oak several times each year. It's a gift my adorable dogs seems to give to me. We live on 11 acres in the Sierra Nevada foothills and getting rid of all the poison oak is impossible. This year, 2013, I got poison oak in February and then bought Rhus Tox and used it EXACTLY as directed and for the first time in years have been poison oak free since February! Thank you!