When the Milesians, that mythical race described by an 11th century scholar in Lebor Gabála Érenn (The Book of Invasions), came to Ireland they banished the natives to the underground and they became the Sidhe, the fairy folk who live underground and sometimes reside in certain trees or bushes, usually of the hawthorn variety. You don’t want to disturb the fairy folk or you might bring some kind of misfortunate on yourself.
Cutting down one of those fairy trees would certainly disturb them. The Irish would go out of their way not to do that. That’s why you might see a lone tree in the middle of a farmer’s field, the base piled up with stones just to be sure one did not accidentally bump into it.
I've witnesed this many times here in Ireland, don't mess with the Fairy tress!
As you walked ( or cycled ) to this cache you have hawthorn trees all around you. Their long sharp spikes and in Autumn, red berries are a dead giveaway.
The cache is a small clip top box with room for small swappables, so not to disturb the faries it isn't in or under a Hawthorn tree but they all around.