Penners
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- Messages
- 17,294
- Location
- Suffolk, England
I've never used Roundup on brambles, but I have found that it's not terribly effective on nettles and woody stuff. SBK Brushwood Killer may be more effective for your job.
http://www.vitax.co.uk/index.php/area/home-garden/weed-disease-control/sbk-brushwood-killer-2/
http://www.vitax.co.uk/index.php/area/home-garden/weed-disease-control/sbk-brushwood-killer-2/