Used Spectracide Weed and Grass Killer several days ago on pachysandra an other items and pachy have changed very little.. I have read somewhere that Spectracide is just a contact killer and will not kill down to the roots as Round-Up but on the label of spectracide it says it kills down to the root. Everything I sprayed is dying except pachysandra and I sprayed it over several times.There might be a slight sign of discoloration and a faint sign of the flower in the center of the plant wilting. Do I go out and buy Round-Up or wait. These pachysandra are very vigorous and have been growing over 30 years in this area.