Suz

I have several "four c'clock" plants in my yard. The former owner allowed too many of them to get established. I have dug up several and have found rizomes bigger than a sweet potato. Several of these plants are tight against the house, the concrete paver holding the propane tank, one is behing this paver, etc, etc. I have cut back hard and used 100% vinegar, even a dose of chlorox. All this to ask for a "killer" that is natural, non-toxic.

Any ideas? Thanks.