Do a search using the words “Hazard treesâ€. You’ll find a wealth of information available. Also buy two books. Buy “Stupsi†first and then if you are still hungry for a heavy dose of information buy “The Body Language of Treesâ€. Both books are by Claus Mattheck- a leader in biophysics. You can find these books at ISA (International Society of Arboriculture).
Waving from a treetop,
Peter Treeman Jenkins