----- Original Message ----- From: "Adam Fikso" <adam14113@ameritech.net> To: <pbs@lists.ibiblio.org> Sent: Thursday, September 11, 2008 2:51 PM Subject: [pbs] plants that NEED an atmospheric pressure change?? > Hello All,. Mary Sue's last post caught my eye re the above. Is this a > known , for-sure fact for any plants? It's totally new to me although I've > wondered about it from time to time. Any data-based responses are welcome. > Adam in Glenview, IL. USDA 5a (sort of) I think there may something to this. In the past when we've discussed how rainfall prompts blooming in otherwise well-watered bulbs, I don't recall this element being mentioned. I do hope there is some research about this. Another thought: After watching a program regarding rain, one thing that stood out to me was the fact that each raindrop forms around a bit of "dust" and that rain isn't necessarily pH neutral. Acid rain etc. Then I thought about the recommendation of foliar feeding of Crinums to help with blooming. Hmmm... Rain as a natural foliar feeding? Robert.