We cleared last August and regrown back. I do this to prevent snakes from hiding and coming into our yard. Anyhow, did this with a trimmer... I did that 4 weeks ago and I am just finally getting over what became a sever rash of chigger bites and either poison oak or sumac. My legs were on fire and I had a massive rash all over my legs and arms. My doctor prescribed me Chobetasol Propionate cream and that finally put it all on the healing path... but it was very painful for about 2 weeks.