Thanks to all of you for your information. I did call Sunny Borders Nursery, and got a call back yesterday. Steve told that they only offered these for sale one year, and were unable to obtain them again. Interesting, as I think of tissue culture, once the technique for a specific plant is developed, as being a reproducible method. (I know, bad pun.) Trillium are, I believe, often infested with a fungus. Not obligatory, as with orchids, just something that is there. And under tissue culture, fungus would over-run the meristem tissue being cultured. Perhaps this has something to do with it - one time the tissue culture lab got lucky. And on another North American native - Mertensia viriginica is flowering beautifully. No idea why this is not more popular, since it is such a great shade tolerant plant, especially for damp to moist sites. Pinkish mauve buds, clear blue flowers. Over the years I've found two individuals with pink flowers. One is a clear pink, the other a somewhat "cool" pink with a hint of blue. The latter is more vigorous but the clear pink grows well. I've seen a white form in another garden, several years ago. And that was a weak, struggling plant. Judy in New Jersey where spring has settled in to stay