I have a lady whose pachysandra beds are over run with thistles. The guy who mows the lawn tried to clean up the bed by pulling the thistles out. Big mistake, now they are worse than ever! An extension agent told me to keep cutting them back and they will use their energy reserves to grow back and eventually die. He also said to wipe them with round-up using a wand or paint brush around the time they flower. Seems like alot? What would yunz guys do?