Reblogged from The Dirt: Uniting The Built & Natural Environments:
Renowned botanists, Francis Hallé and Peter Del Tredici, came to the University of Virginia (UVA) to teach landscape architecture students about the architecture of trees. Hallé is a professor emeritus at the University of Montpellier II, where he studies tropical rainforests. UVA landscape architecture chair Teresa Gali-Izard, International ASLA, introduced him as a botanist, biologist, artist, and poet. Del Tredici is a botanist and research scientist at Harvard’s Arnold Arboretum and professor at Harvard’s Graduate School of Design. His research includes wild urban plants and plant morphology.
As the first workshop on Saturday afternoon began, Hallé defined plant architecture through 22 known models of tree growth and morphology. We learned how certain logic plays out in the growth of a tree. The diagrammatic quality of his drawings demonstrated growth habits and the potential for reiteration, which refers to a tree’s response to damage with the redirection of nutrients. Hallé developed concepts of reiteration and tree adaptability, explaining how these capabilities formed out of tree evolution.
Hallé insists the key to understanding trees lies in the difference between unitarian and modular models. Unitarian trees have ancient methods of reproduction – they are consistent and symmetrical throughout their entire life. When a unitarian tree is pruned, the plant lacks the means to reproduce from the cut. Modular trees work in a more complex way – as the tree grows the branches create a dendritic pattern. When a modular tree is pruned, the tree responds through reiteration. A modular tree is adaptable because it can reproduce more modules of the original tree form throughout the canopy.