A rare sight of a double tree of Casorzo growing atop another tree Of course, it’s not a sight that you get to see every day. But here you can learn about a unique tree growing between Grana and Casorzo in Piemonte, Italy, recognized as the “Double Tree of Casorzo” or Bialbero de Casorzo in Italian. This is a mulberry tree on top of which a cherry tree grows and rises well above the mulberry tree on which it stands.
The Double Tree of Casorzo is also recognized as the Grana Double Tree. No one exactly knows the exact reasons why this happened. Perhaps various birds dropped a seed on top of the mulberry tree, which then grew roots through the hollow trunk of the host tree to reach the soil.
Though trees growing parasitically over another tree are not rare, they usually do not reach the size and lifespan as seen in this specific example, as there is not adequate humus and space available where they grow. Large “double trees”, also called epiphytes, like the Bialbero de Casorzo, are a rarity.
Both trees combined make for an inspiring sight, with their branches spreading 5 meters across. The double tree’s lifespan has been astonishingly long, given the detail that the cherry tree receives all its nourishment via the mulberry tree. Well, though not the only double tree, it is probably the most impressive-looking tree in the world.
Both trees are thriving from the same source of nutrients, and yet they are able to share very well. Indeed, the Double Tree of Casorzo is a rare sight in the world.