Thank you Michael for checking Amazon! 17-21 C does make sense for summer soil temp. And I also suspect that cooler winter temperatures than 9C are acceptable in situ, if not in Dutch greenhouses -- I would guess at least 3 months worth from Lee's Guernsey data. One further note: I transplanted my few N. sarniensis ('Corusca major', as it happens) about a month ago. They were growing in my local clay with rather more shade than I'd intended. They had not received any intentional supplemental water -- the soil was completely dry. The bulbs were firm, large, and scaling nicely, but they did not have extensive fleshy roots (at least not compared to the Boophane I inadvertently disturbed during the transplant). They produced many leaves last year but no flowers. I moved them to a hotter and drier spot, which may have been a mistake... We'll see how they respond. Best, Max Withers Oakland On 8/31/10 3:10 AM, email@example.com wrote: > To summarize: plant in the fall and grow at 17-21C (62-70F). After > flowering is finished (around November in the northern hemisphere), reduce > temperatures to 9-12C (42-55F) or possibly lower -- temps lower than 9C were > not tested in the research. In the spring, gradually increase temperature > as the foliage starts to yellow. Bulbs are generally dormant by the end of > April, and should spend the summer in the 17-21C (62-70F) range.