The American Horticulture Society developed a map to show the different heat zones and ranges of high temperatures. This map is certainly relevant to Texas gardeners. Often, our plant selections that thrive in April just can’t take the heat of July and August.
For Rockwall County, we are in Heat Zone 8. Here is the map of the East portion of Texas – notice how Tarrant and Dallas Counties are zoned higher than our area. Too much concrete?
American Horticulture Society Heat Zone Map
The key to the Heat Zone Map:
rockmga.org 