I've always believed that the world's oldest potted plant is a Cycad growing in Kew Gardens, London. Dating from 1775, there were reports about it being repotted a few years ago. See
http://www.dailymail.co.uk/sciencetech/article-1203029/Worlds-oldest-pot-plant-gets-new-home-epic-repotting-Kew-Gardens.html
Here it is:


However, I've just visited the Herrenhausen gardens in Hanover, Germany and they claim to have a much older potted plant.
Here are my photos of it


The notice says 'The oldest potted plant in the world: this pomegranite tree came from Venice to Herrenhausen in 1653'

Can anyone beat that?

Mike/Citrange

http://en.wikipedia.org/wiki/Bonsai


Bonsai dating to the 17th century have survived to the present. One of the oldest-known living bonsai trees, considered one of the National Treasures of Japan, is in the Tokyo Imperial Palace collection.[20] A five-needle pine (Pinus pentaphylla var. negishi) known as Sandai-Shogun-No Matsu is documented as having been cared for by Tokugawa Iemitsu.[20] The tree is thought to be at least 500 years old and was first trained as a bonsai by, at latest, the year 1610

I've seen the worlds oldest potted plant (Cycad) growing in Kew Gardens, when I went to England to attend the Chelsea Flower Show. At that time it was still growing in the old container. Transplanting a plant as old as the Cycad, must be a scary situation for the person/persons doing it. - Millet