The grey alder is not endangered in Germany. However, due to the lack of river dynamics in the floodplain forests, the existing forests are changing more and more and evolving into hardwood floodplain forests. Therefore, the grey alder has less chance of survival there. In total, approximately 2.1 million trees in 506 stands were documented in the course of the project.
The main distribution area of the grey alder is south of the Danube. Five gene centres in three regions (Southern Bavaria, Harz and Mecklenburg-West Pomeranian Lakeland) have been located for grey alder. Due to the extremely low diversity of grey alder, targeted ex situ conservation in seed plantations is recommended in order to establish populations with higher diversity.