I haven't been following this thread too closely because I know that I will never get Nerine or Crinum to flower here, but I should mention, in addition to absolute temperature in terms of daytime highs, many plants seem to be sensitive to temperature FLUCTUATION. In areas where atmospheric humidity is low in summer, such as the American West (especially outside large cities, which experience a "heat island" effect), the difference between daytime and nighttime temperatures is usually much greater than in areas with high atmospheric humidity, such as North America east of the Rocky Mountains. As a result, plants evolved in humid environments experience almost nightly lows to which they aren't adapted, and so we in the West often notice that plants from the East dwindle away over a few years, however much we irrigate them in summer. I find the same to be true of many plants from Japan. In respect to bulbs, this fluctuation would be moderated within the bulb itself, but if the leaves of a summer-growing bulbous plant (which are making food for the bulb and flowers) suffer a "dormancy trigger" every night when the temperature drops 30 or 40 degrees Fahrenheit (as it does where I live), this may affect bud formation. I have no trouble flowering bulbs whose leaves are dormant in summer, even those from warmer climatic regions near the shores of the Mediterranean. Jane McGary Northwestern Oregon, USA