Posted: 31/08/2012 at 01:04
Sodium Chlorate is a NO, NO, NO!! It is illegal to sell it now and you will not be able to grow anything where you use it for years. Many years.
Brute force is best with brambles. Dig them up and burn the roots. There will be some minor regrowth from any roots left in the soil, but cultivation will deal with that.
Agricultural Roundup is a possibility - expensive to buy initially, but much much cheaper in the long run - but it will not kill brambles outright. It will stop the shoots growing but you will not kill the bramble outright with one application.
I cleared a large garden of 8 ft high brambles by digging them up. It is an excellent scheme to take you into the Autumn/Winter. Do it regularly but do not overdo it in your enthusiasm.