Posted: 09/06/2014 at 12:41
Hello , the allotment next to mine covered freshly dug ground with huge amounts of horse manure , it held back the weeds for about 6 month , then they came through with renewed bigger , take care !
have you considered digging a ditch down to the stream / bog garden and filling with rubble ? to help drainage , could even be made into a path
best of luck