Travis, A Google search of "Erythronium life-history" (without the quotes) finds a report suggesting that E. japonicum has a normal life expectancy of about 40 years: http://onlinelibrary.wiley.com/doi/10.1111/… This number could vary greatly between species. The previously mentioned 2007 NARGS Erythronium article contains some useful and interesting horticultural information but readers can easily be mislead into believing there are two acceptable "subgenera" of Erythronium which is not true. This article completely ignored the most relevant and recent literature available at the time, presumably because it contradicted the author's hypothesis: http://jstor.org/discover/10.2307/… Nathan At 09:01 PM 3/15/2015, you wrote: >Anyone know how long an individual bulb can live? Longer than me, I'm sure.