We make masses of comfrey "tea" every year - bl***y stuff comes up all over the plot and the roots go yards deep, so we reckon that by cutting it down and making fertilizer out of it we're killing two birds with one stone.
But boy, does it stink!!!!
Never tried horse poo. We've got a stables on-site so there's a great mountain of the stuff to barrow away. During the winter, the liquid from the heap runs away, mainly onto the nearby plot, where Dennis grows the most amazing runner beans, so there's obviously something in it. Might try making some this year.
Trevor