?Bermuda lawns go dormant in North Texas when we get our first frost, which is usually around Thanksgiving. The grass turns yellow or brown and many home owners think their lawn is “dead”. However, the roots under the soil are still alive and when the warm weather returns in the spring, the bermuda lawns will green up. Bermuda lawns are very susceptible to weeds during dormancy. Germinating weed seeds in a dormant bermuda lawn don’t have as much competition for sunlight and nutrients as they do when the grass is green. This is why it is of critical importance to get your pre-emergence applications down BEFORE the weeds germinate. The most important applications we make all year are the applications we make in the fall and winter. But any time is a good time to start a program of weed control and fertilization.