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this awful weed has spread like wild fire in my garden? which is the best way to get rid of it???
Bruise the leaves then spray or paint with glyphosate - then leave it alone until it is brown and withered - may take some weeks - this will show you that the glyphosate has reached the roots and they are dead. If you cut it down or pull it up before this stage has happened you will leave bits of living root in the soil, and have to do it all over again.
If you do it properly it will work - you need to do it now or the plant will start to die back in the autumn and then it won't absorb the glyphosate properly and then you'll have to do it again in the spring.