Here is Dawn with a trench she has dug, close to our compost loo in the field. It has been planted up with comfrey root cuttings, and hopefully willl grow into a thick patch of the stuff. The idea is that its deep roots will bring up nutrients we can use on the veggies as well as mopping up any excess nutirents from the toilet. We shall encourage it to be used as a urinal as well, as comfrey will sort out the all the nitrates in that. Of course rotted comfrey leaves are great plant feed, as both a mulch and rotted down into comfrey liquor.