Here is a picture of a group of skeleton fork ferns (Psilotum nudum) that have been showing up left and right in almost every tree pot in the museum. Volunteer plants, or weeds, are an endless battle, although sometimes you get lucky and less invasive plants start to pop up that are sometimes beneficial. In many cases, having small companion plants in a tree’s pot effectively adds to the illusion that the tree is indeed full-sized, only in miniature. This particular plant is extremely interesting as it lacks roots, but still manages to spread everywhere. As there is no fear of them stealing a significant amount of nutrients or water from the trees (no roots) we generally let them do their thing until they become an aesthetic problem.