Founded in 2008. The Landscape Juice Network (LJN) is the largest and fastest growing professional landscaping and horticultural association in the United Kingdom.
LJN's professional business forum is unrivalled and open to anyone within within the UK landscape industry
LJN's Business Objectives Group (BOG) is for any Pro serious about building their business.
For the researching visitor there's a wealth of landscaping ideas, garden design ideas, lawn advice tips and advice about garden maintenance.
Replies
Adrian, in short yes it will, but you may have to treat any regrwoth. It may be an idea to look at one of the stronger formulations of glyphosate such as Roundup 450 to ensure you get enough active ingredient down the the roots.
Hope this helps.
Ollie
I have killed this succesfuly in 28 days with Glyphosate mixed to 32g/l strength in tank (100ml concentrate in 1l water), and sprayed to all leave leaves to a slight drip off.
Its too late in the year to treat it now, and you Will have to wait until April next year, and spray the young re-growth.
As David says - treat foliage in april/ May when it is growing actively and it reaches height of approx. 1m. Its a biennial plant so spraying once flowered largely ineffective - cut & stem fill with glyphosate not as effective and certainly more dangerous to the operator than a foliar spray with 360g/lt glyphosate at 6L/ha rate(approx. 300ml in 10lt) .
Once top growth is dead this year - a careful and thorough dig of the roots can reduce numbers in the following spring but best to burn on site to avoid falling foul of the Wildlife & Countryside Act (ie: transporting/ spreading invasive species)
Good luck
its not so much the label as the growth habit of the plant...once it has flowered it pushes its energy into seed production not growing...spraying will knock off the top growth but so will the start of winter...the main aim of spraying is to prevent re-growth by killing the roots..