I do this too. I also teach my kids to thank trees for shade on a hot day, and also for oxygen on every day of the year. Now they even do it themselves, without prompting!
I have to say it was my first time (in Valby Parken) and I loved it! It was like hugging some big, peaceful animal:)
Which book was it? Did you ever read "The Secret Life of Plants"? Available at the libraries here!
There were no books. This is a "licentia poetica":) I'll check the one u mentioned.