I really don't do many fert aps (maybe 4 to 5 jobs a year only when asked by current customers only!) but when i am asked to do the job i use a granule fertilizer and i ask my fertilizer dealer what her would recomend i use to get the job done right. The last 2 fert jobs i did i put down a 17-2-11 weed & feed on St.Augustine lawns per the advice i have been givin by my local fert dealer and the problem im having is the weed & feed that im using says it kills dollar weeds but ive noticed that more of the dollar weed has grown and none and none of it is dying. The fert dealer has said to me ooooh just give it time! I don't feel this is the correct answer? Before i did the jobs i adjusted the irrigation to ensure proper watering times & coverage and i took some fresh soil samples to the dealer and he did a ph test and said to use the 17-2-11 so i did. I feel i have done the best i could do to ensure a good quality job! But does anyone know why this seems to be happening???