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That is what we have been advised by the Botanics staff. The exclusion of Trillium is interesting because at least one list I consulted considered Trillium to be resistant. I wasn't expecting Trilliums for the display, but we must also exclude them from the plant sales too. Hopefully John or other colleagues may be able to give a fuller explanation.
Here's the answer, Maggi, in an email from John:The reason why is they are North American and have been identified as hosts of Pr and as such with the SPHN having been served they cannot come into or leave the garden.It is getting harder and harder these days to grow plants.Yet another thing to worry about...