Experts at the Ansbach gardens have been tending to their agave plant – also known as a century plant - for over 50 years, waiting for the moment when it would flower.
And on Wednesday, they announced that not only was their prized agave blooming but that the flower stalk was shooting up at around 10 centimetres per day.
The first agave plant to bloom in Germany was in the same Ansbach orangery, way back in 1626. An American agave resembles an aloe vera plant, but grows a stem up to 10 metres high with big yellow flowers just once in its lifetime.
Originating from Middle America, the American agave is related to Germany's favourite vegetable, the asparagus.
“When it was measured this morning, it was standing at around 2.80 metres tall,” Jan Björn Potthast, a spokesman from the team that manages Bavaria's state-owned castles, gardens and lakes, told The Local.
But the impressive bloom of the American agave is also its swan song, as when the flower dies so does the plant. Visitors have up until around the end of May to see it in the warmth of the orangery, after which it will be too big to house indoors and will have to be moved outside.
“It takes skill to get an American agave to bloom,” said Potthast. But he said he and generations of Ansbach experts before him were sworn to secrecy about what they do to get the exotic plant to flower.