Here in the Houston area, we stay fairly warm in the winter compared to other parts of the country. There are times when a cold front blows through and we dip below 32 degrees. Because of this, we need to think about protecting our plant, pets and pipes during that time. Part of preparing for the freezing temperatures, you must winterize your sprinkler system if you home has one. Two years in a row, I didn't winterize my sprinkler, and both times, it costs me 75 dollars in repair costs. So now I always winterize!! Here is a sprinkler system backflow preventer that has frozen, then cracked, and then when it thawed out, it became a geiser! Not good for the water bill!