Trees: simple questions, arduous answers
What is a tree? We all know how to recognize a tree, even from far away and from the tender age. When asked to give a formal definition, however, often all...
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Myths and truths about lichens
What are lichens? Lichens are unique organisms. They are a symbiotic association between a fungus and an alga. More precisely the term "alga" indicates whether a cyanobacterium (Cyanobacteria) or a green...
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The root graft, a beautiful example of collaboration
In the common imagination, each tree is seen as a distinct entity, which competes with contiguous plants for space, light, water and nutrients. This traditional conception is radically changing and...
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The (un)known inhabitants of the soil
Sit under a tree crown. Hidden under your feet is a complex and mysterious world, the rhizosphere. The rhizosphere is “the field of action of plant roots” and can be...
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Odi et amo: Public opinion on urban trees.
Cities are complex systems that include human-created and natural components. With the increase of development and urbanization, people unavoidably act by modelling the landscape according to their preferences. Understanding their...
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