Variegation on Amorphophallus

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Several years ago I acquired a nice sized tuber o A. 'Shattered Glass.'  About half the leaf lobes ere all white and this continued progressively from year to when last year there were only two variegated lobes and the size of the tuber had reduced to a little smaller than a small Girl Scout cookie.

So this year, before planting, I cut our the middle of the tuber, thinking either the remaining tuber would put out a nice leaf or rot.  The remaining tuber has now put out three new petioles with leaf lobes about the same variegation as the original plant

Any ideas would be appreciated?

David Leedy