home depot will exchange or refund you if you return it with a receipt. I suggest you do. Try again, get a new plant and put in a bigger pot with well draining potting mix. It is probably too cramped in the growers pot, and probably did not get enough water in your care.

It may not be completely dead, but it is pretty far gone so no harm in trying again.

looks dead to me. You should have transplanted it to a larger container.

Even better - should have transplanted it to the ground, and they seem to do best when it is not exactly the richest or nicest soil. I've been getting new lavender plants growing from seed - it seems not all regularly fail to survive through the summer, but the ones that do bloom and are beautiful in future years.

True - ground planted lavenders thrive better. They just require well draining soil and they do reseed easily as mine have in the past. I just suggested larger containers taking a cue from the other potted plants in the area. Perhaps this was supposed to be a containerized garden.