My 59 had the obligatory tree growing through it, and from the same guy, my 47 jeep also had a tree growing through it. I wonder if there is something about the shade or cover that helps trees grow through these things. Or perhaps its the squirrels living in them, dropping accorns and what-not that makes them planters.

The jeep had about 1 foot of detritus in it and it was becoming quite a planter. It also had about a bazillon fire ants in it.