Calcareous substrate flora
The area includes species that grow on alkaline substrate, a layer rich in calcium carbonate, nutrients, and mineral microelements. It is split into a number of rockeries, including the Aosta Valley calcareous substrate rockery in which we find the Aster and the previously mentioned Leontopodium and Saussurea, as well as other Saussurea species. The eastern and western Alps calcareous rockery contains remarkably beautiful plants, including Silene, Minuartia (that forms a mat of small pink flowers), and Rhododrendon hirsutum that replaces the Rhododrendon that grows spontaneously in the garden when the environmental conditions change.
Cover image: ©Antonio Furingo