It may be a disease but is more likely due to overly saturated soil conditions. Those plants hate to have wet feet. You might want to take a sample from your plants in to your County Extension Office for them to look over and possible diagnose some other problem that may be evident with the sample in hand. If you want to grow Texas sage in the rainy eastern parts of the state it is best to plant them on a raised bed so excess water drains away well.
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