Long time ago Judy wrote: "Orientation, solar orientation that is, is another major factor in my opinion. Yesterday's snow squall left a dusting of snow on the ground. By early (8:30 a.m.) morning the snow was gone from the sunnier side of the road, still present on the shady side (where, naturally, our house and garden are located.) Sometimes this shadier site is helpful. Cooler conditions keep slightly tender plants from premature growth that gets nailed by a frost - Arisaema ringens has not been slapped back because it sensibly waits to emerge, influenced by the generally cooler conditions." A bit away from geophytes, and a rather late response, but .... I live on the south, and so north-facing, side of the Kennet valley. I well remember going out one June 7th morning and finding a few brown spots on my potatoes. I felt surely this is not blight as I had done the usual protective/preventive spraying, but this patch I must have missed. However, the local weekly paper reported a few days later that the local farmers on the north side of the valley (and so facing the sun fairly early in the morning) had had their potato crop devastated by frost. Frost this late in the year is very unusual here, which was why I did not even suspect frost as the cause. Such frost as had hit my crop had melted before the sun reached it - it's not the frost that does the worst damage, but the rapid change of temperature caused by the sun on the frosted foliage. Regards to All Hamish Central south UK Wettish zone 9