There is a scientific approach to humidity as far as horticulture is concerned. I don't have the specific reference anymore, but the investigator created an index of transpiration stress. It involved rainfall and relative humidity both, as far as I can recall. I think Lee Poulsen first called this humidity/transpiration study to my attention. Lee, do you still have that URL? There is a fairly regular gradient from the high humidity East Coast of the USA to the dry climate of the Rocky Mountains. The rainfall/humidity are highest in the East, the transpiration stress is highest in the mountains of the West. This index does not take into account the warm nights of the East vs. the cool nights of the West. The nighttime temperatures are as important, even more important sometimes, than the transpiration stress for growing many South African bulbs. Jim Shields in central Indiana ************************************************* Jim Shields USDA Zone 5 Shields Gardens, Ltd. P.O. Box 92 WWW: http://www.shieldsgardens.com/ Westfield, Indiana 46074, USA Tel. ++1-317-867-3344 or toll-free 1-866-449-3344 in USA