Cut'n'Paste gel works well pasted onto the leaves of weeds

Even hardy weeds like Ginger and Agapanthus respond to the unique combination of ingredients in Cut'n'Paste and yellow in a couple of weeks.  Experiment with pasting onto stems of large weeds with green stems, scoring trunks of large weeds before pasting to increase the uptake.  Just painting a dozen leaves of small scrubs will often do the trick.