the problems with most weed and feeds is that they way our weather is down here,its ususally too early or too late in the season to do both at the same time. You should put down the weed part in late winter or very early spring to kill the weed seeds in the soil before they germinate(like ray said) However, you do not want to fertilize your lawn till after the frosts are gone and the good grass starts flushing out. So, its better to treat with a pre emergent herbicide like dimension early,then come back with a good balanced fertilizer a little later as the weather warms in the spring. Most weed and feeds dont do a real good job on weeds that are already up. Vantage and image will kill most of your weeds in your beds and lawns. Sedgehammer is a real good product for killing them curssssed nutsedges or coco grass.Remember, pre emergent herbicides dont last forever,so re-application after 3-4 mo. is necessary,specially during rainy seasons.
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