Quaker Oaks (2014)
friendsjournal.org
friendsjournal.org
I would put forth an alternate theory that's a bit more practical. Quaker Meeting takes place on Sunday mornings, some as late as 10 or 11 am while the sun is heading towards peak. Most of these Meeting-Houses were constructed in an era well before air conditioning or fans, so anything that provided shade to keep the building cool in the warmer months would have been worth cultivating and protecting.
I think this might be different in the historical quaker strongholds like parts of the US east and England, but even having a quaker meeting house to go to is probably not part of the experience of being quaker for most of them. Shit iirc the majority don't even practice the silent worship anymore right?
The most evangelical branch (EFCI) often refer to their congregations as 'Friends Churches', and have buildings and service styles that aren't radically different from other protestant churches. At the other end of the scale there are also meetings which hold fast to traditional silent worship, some with a very liberal theological attitude and some (though fewer) with a conservative one. There are a lot fewer Quakers in this 'unprogrammed' tradition in the world, though, partly because the more evangelical and orthodox programmed meetings were quite active in missionary work.
In Britain, FWIW, almost all of us follow the unprogrammed tradition (and would definitely refer to our building as a meeting house, or meet in a community centre or something - the building is not important in our theology). In the US less so, though unprogrammed worship is fairly strong in Pennsylvania and a few other places.
The reason it was interesting to me is that before I decided to start going to meetings again as an adult, I actually didn't know that ANY quakers anywhere did anything other than silent worship. So to find out that not only does it exist but is probably the majority of quakers today was jarring.
I shot some video and we only walked the 2 mile boardwalk but I'd go again with a guide for sure. https://youtu.be/_4szw1gzBKc