One of our prize plants in the garden is the Tarahumara Oak, Quercus tarahumara. This truly odd oak is native to Northern Mexico, where it resides in the Sierra Madre Occidental Mountain range in the Mexican states of Chihuahua, Sonora, Durango, and Sinaloa.
In cultivation, Quercus tarahumara is extremely rare and of high conservation value. It seems that there are only a few plants existing in cultivation, although a few others in collections turned out to be hybrids. So far, temperatures in the upper single digits haven’t posed a winter hardiness problem.
Quercus tarahumara is named after the Tarahumara Indians, who live in the botanically rich region, popularly known as Copper Canyon.

The foliage is ridiculously thick and feels like hard plastic. Turned upside down, the leaves function quite well as a drinking cup or small sink.

I’ve long admired this species from afar. Will make a point to check out your specimen sometime. Any chance you also have Q. crassifolia?
We haven’t tried Q. crassifolia yet.