I was intrigued by the range of responses this question elicited, so I did a little research. Relevant results from the most recent review I found: 1. > For 27 out of 32 pathogenic fungi, all six oomycetes, seven bacterial > pathogens and nine nematodes, and three out of nine plant viruses, a > peak temperature of 64–70°C and duration of 21 days were sufficient to > reduce numbers to below, or very close to, the detection limits of the > tests used. 2. > Several plant viruses were temperature-tolerant. These were CGMMV, > /Pepper mild mottle virus/, /Tobacco rattle virus/, ToMV and TMV. TMV > requires a peak compost temperature in excess of 68°C and a composting > period longer than 20 days for eradication. However, TMV is degraded > in compost over time, and can be eradicated after a composting period > of 26 weeks, even at low temperature (31°C). ToMV in infected seeds > can withstand over 70°C in an incubator for over 20 days. [TMV= > tobacco mosaic, TomMV= Tomato mosaic; 31 C= 87.8 F; 70 C = 158 F] 3. > It is clear that the detection limits in most studies were quite poor, > with infection levels of up to 5% likely to be undetected regularly Noble and Roberts, "Eradication of plant pathogens and nematodes during composting: a review," Plant Pathology 53 (2004), 548–568. http://blackwell-synergy.com/doi/abs/… Since my compost undoubtedly already harbors a wide array of pathogens, I will probably add the narcissus and keep the result far from my important plants. I like Diane's suggestion of naturalizing best (though it wouldn't solve the disease problem), but I can't say I love the paperwhites. Thanks all, Max