Wilko garden weedkiller 3 litre is a ready to use formulation for the control of annual and perennial weeds on areas not intended to bear vegetation or on areas of unwanted vegetation wilko garden weedkiller is a non selective weed and moss killer active against soft plant tissue with which it comes into contactweeds or moss are controlled by covering their foliage completely and evenly with spray soon after spraying the foliage of treated moss or weeds begins to wither and die plant roots