Medieval relict plants at Hammershus
Hammershus and the area around the castle is a very interesting botanical site. 50 different plant species can be traced back to the middle age where monks at Hammershus imported and grew them for medical purposes or for consumption. These plants still survive to this day as living relicts and reminders of the past.
Among the medicinal plants is the poisonous black henbane or stinking nightshade (pictured below) which have been used in medicine for more than 5.000 years. It was used as a seditive and in larger doses for assasinations. More peacefully the mullein which can also be found at Hammershus was used to treat cough and in skin balms.
Hammershus is one of the richest botanical sites in Denmark, and the Nature Agency is actively preserving the medieval relict plants as well as the hundreds of other species in the area around the castle.