That is the rational thinking, but above all there is the simple pleasure to create with the help of nature in its greatest diversity and to feel like part of it. There are many microclimatic conditions due to the different slopes and exposures to sun and winds. In the Arboretum, rocks are mainly limestone, but not exclusively.
Investigations are still under way.
Measures effectuated in the different fields of the Arboretum show a wide range of pH from as low as 4.1 to as high as 8.5. 2.6 Average number of days min. 62.8 Average number of days min. 9.8 Average number of days min. A plantation of Abies grandis died when 30 years old.