Angelica keiskei koidzumi.
This rare plant is native to the Japanese island of Hachijojsma and is renowned for its rejuvenating properties.
The stems are edible and the leaves can be used in tea. The stems and leaves are high in vitamin B12, which is rather unusual in plants.
Best planted in a shady position, Ashitaba will flower twice a year and can grow to 1.5m.