This is the common denominator of walnut wood.
It takes more than 50 years to reach a diameter of 30 cm, the minimum established for being able to work it. It is hard, very hard, and sawing it is difficult and expensive, although afterwards it is generous in the refinement of the piece. And resistant, very resistant; almost eternal designer pieces. Walnut wood resists changes in temperature and humidity. Perhaps because in the wild its roots produce negative vegetal alleopathy, that is, they inhibit the growth of other plants in their environment to avoid competition. Walnut wood is a born fighter.