I've tried lots of lavenders over the past few years and none of them have done very well, either outright dying or just withering away and looking terrible. Mostly, I think it's because my garden is pretty humid and the "Houston black" clay is really challenging.
Finally, I found one that is doing great, a variety called "Goodwin Creek." The plant tag said it did well in the humidity of San Antonio, so I thought I'd give it a try.
I bought to new ones this year to fill in some space, and they too, are doing fabulous thus far.