Resolva xtra tough weedkiller liquid sachet 3 litre 33 extra free is a systemic total herbicide containing glyphosate it kills perennial broad leaved weeds such as bindweed brambles buttercup common nettle creeping thistle dandelion and field bindweed perennial grasses such as couch grass annual grasses and broad leaf weeds are also controlledwarninguse plant protection products safely always read the label and product information before use