Answer: Based on your description I am not sure what is happening here. I have never noticed a bad odor associated with this plant and in a brief search I did not find any references to it having a bad smell. So honestly I do not think it is caused by the plant itself. There must be something else that is going on. Is it possible an animal such as a dog or cat is marking it regularly? Or routinely "using" the area beneath it? Or a dog is burying old bones under it? Or is some animal burrowing underneath it? I think with a little detective work you may be able to figure out what is happening. Good luck with the mystery!
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