John McGaw wrote

"Considering that people intentionally spray their fruit trees with
dormant oil -- a petroleum based product meant to kill off insects -- I

doubt that a minute amount of WD-40 on a tool would be a great danger
to
the plants. One of the commonly suggested treatments for garden tools
is
to keep a bucket of coarse sand saturated in oil (often waste oil
drained from a vehicle!) into which tools are plunged to clean and coat

the metal and I've not heard of any problems with the method."




Why should it be harmful? Petroleum is organic. Some people seem to
think that anything organic is magical, don't they?