Posted: 08/12/2014 at 11:26
I've had great success with SBK brushwood killer. I prefer to spray in spring when the new leaf has emerged, having left the long stems to give me plenty of leaf to treat. This product will kill anything green it touches and also remain on the ground surface for about six weeks killing any seedlings that emerge. With this in mind I lay the bramble stems on cardboard, placed on the ground, to protect the grass and use boards/more cardboard upright to protect the plants. Choose a day with no wind to cause spray to drift where you don't want it and spray as much leaf and stem as is available on the cardboard. It will take weeks to show signs of having worked but it does kill the roots of the stems it touches.