Yarrow Fertiliser

by George Harding
(Wellington, N.Z.)

With the verges of the highways and byways around my patch in Wellington showing plenty of Yarrow in flower and the WWW listing hundreds of comments on using it as a compost accelerator but little about using it as a liquid manure as I use Comfrey, are there any "No Digger's" or organic horticulture practitioners out there who have used this and if so, what is the most effective part of the plant, flowers, stems, roots or the whole plant?
I assume the usual fertiliser "tea" principals of, a weak tea solution as I did recently using stinging nettles. Oh boy, if you think Comfrey liquid manure pongs, try stinging nettle manure, it is real "organic" experience.
Merry Xmas to all
George