Both these plants are winter annuals and start to grow in the fall. They spend the winter as small plants and so most people do not pay much attention to them until they start to flower in the spring. Trying to kill either one at this late stage with a herbicide usually is a waste of time and money. Though plants may be burned back, they will rarely be killed. So what should you do? Remember, these are winter annuals that will die as soon as the weather turns hot. Keep the lawn mowed until nature takes its course.
However, you can do something next fall that will help next spring. Henbit and chickweed usually germinate about mid-October. Spraying with 2,4-D, Weed-B-Gon, Weed Free Zone, Weed Out, or Trimec in late October to early November can go a long way toward eliminating these plants as they are small and relatively easy to control. Choose a day that is at least 50 degrees F. These herbicides will work at temperatures below 50 degrees but the weeds are killed at a slower rate. You may also use a preemergent herbicide for lawns in late September as long as have not recently put down grass seed. Spraying with the postemergence herbicides mentioned earlier will also catch dandelions which the preemergent herbicides will miss.
Spot treating may be needed in the spring (March) whichever method of control you use but is more likely with the use of preemergent herbicides. Use Weed Free Zone, Speed Zone, Weed Out, Weed-B-Gon, Trimec, or one of the special henbit herbicides early in the spring before they have put on much growth. (Ward Upham)