Evan,
The one you sent me is going dormant now as well - must be on same timing as yours. They topped out at 5 leaves each. My S. giganteum is still up, though, and has produced 7 leaves per plant, plus numerous offsets that have their own small leaves. Most pictures I've seen of S. giganteum have one or at the most, two, leaves. I'm looking forward to seeing how large the tubers get with such intensive photosynthetic input. One fact about the multiple leaves is that each successive leaf was somewhat smaller than the previous one. Most of the Typhoniums are still up and running, with a few still blooming. I expect they'll start to go down in November.
As far as what made them so precocious in leaf production, it may be my robust fertilization regime involving both incorporated 18-6-8 Nutricote and regular applications of dilute Miracle Gro solution.
LariAnn
