Posted: 01/08/2013 at 16:53
I leave a barrel of water standing on my allotment and throw in any mares tail, bindweed, dandylion etc that I pull up. at the end of the year I empty the barrel of all vegetable matter an put it on the compost heap (making sure I haven't put anything in the barrel for six weeks). The liquid left in the barrel is high grade plant food.
Only drawback is it whiffs a bit