1. An ecological species
2. Natural qualities
3. A source of local employment
Such particularity confers an important resistance to rot and to insect attack.
(The 400 years old carpentry of Cluny Abbey's grain-loft is free from cobwebs reputably owing to the repulsive action of tannin.)
*reference : http://www.parcdumorvan.org/fic_bdd/pdf_fr_fichier/1164034276_LE_CHATAIGNIER.pdf