Meiji Jingu Shrine III

Inside the main courtyard, there was an area dedicated to bonzai trees. Preserved by the shrine, these trees were nearly all over one hundred years old. This one was grown (or "trained") around a stone at its base. The leaves were flawless. Surely someone tends endlessly to these plants, pruning them to complete perfection.

If I remember correctly, there were a few that were over two hundred years old. Must they be replanted, or is the base also two hundred years old?