maybe a titan arum or other large Amorphallus... there are a few types that grow to a similar size but why would 'home depot of all places' be selling titan arums/ giant amorphalluses when konjac is smaller/cheaper/ easier to find and doesn't need as much care..
granted Konjac isn't small either it will grow to 5 or 6 feet but that's tiny compaired to a titan aums 30 foot leaf. the tuber of a mature titan arum can be 200 lbs.
