
Right, If you dont want to use things like Chemicals (and I use them alot, and just keep animals off untill the chemical has dried, I have not had anyone complain their animals have been ill yet ;) )
How about chopping them back, and pouring salt around the roots :)
I dont know how many you have, but Salt kills tree roots if you put it on them, So I presume (I have never tried this as I have a licence to use stringer chemicals then the public are allowed to use!!!!) it will work the same way :)
Just each Bramble back to about 2" and pour a heap of salt around the base!!!
Ony problem with that is it will use alot of salt :)(but you can get bags from Tesco at 26p a bag LOL)
HTH
Lea :)