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Thank you Herman. I really like Trilliums, and mostly they grow well, but for some reason I lost my T.grandiflorum last winter. It wasn't even a very bad winter so I don't know why it never came up in the spring. I'm glad I have seedlings of T.grandiflorum growing now.
It was also here very dry last summer, and hot, and the bed where my T.grandiflorum was, was drier than the ones where T.chloropetalums are. I hope you are right, and I will dig carefully to see if the rhizome is intact. Can Trilliums be below ground for one summer and then still come up the next summer?
Plants native to the west coast of North America are accustomed to rainless summers (unless they grow in Alaska, which seems to get daily rain). That is probably why your chloropetalum survived while the eastern grandiflorum, which expects rain in the summer, did not.