Quercus castanea Née

Quercus castanea is one of the more widely distributed oaks in Mexico, found in over fifteen states and over a wide altitudinal range. It is also found in El Salvador and Guatemala, where it grows at even higher elevations than in Mexico. It favours deep, well-drained, sandy clay soils on rocky hills, scrubland, open valleys, and steep slopes and ravines. In Michoacán, it grows on volcanic soils with neutral to acid pH (le Hardÿ de Beaulieu & Lamant 2010). Though widely distributed, populations of this oak are somewhat fragmented due to agriculture and urban development, supporting a relatively limited number of individuals. Despite this fragmentation, populations of Q. castanea maintain high genetic diversity (Wenzell & Kenny 2015).

It is also widely distributed in collections. It is valued in cultivation for its leathery foliage that emerges deep red before turning glossy dark green above with deeply impressed veins and grey-white beneath (Pan-Global Plants 2023). The acorns ripen in the first year, which sets it apart from most other red oaks. A specimen at Kew, grown from seed collected in Jalisco and planted in 1982, was about 8 m tall in 2006 and reached 14 m × 31 cm in 2019 before dying in 2021 (O. Johnson, pers. comm.). It was the finest tree of the species seen by Grimshaw and Bayton (2009). The current UK Champion grows at Chevithorne Barton, Devon, where it reached 10 m × 16 cm in 2017, developing from a rather bushy 3 m tree in 2008 (Heathcoat Amory 2009); smaller trees are found in several other gardens in central and southern England (The Tree Register 2026).

In Europe it has reached 10 m and fruited at Arboretum Chocha in southwestern France (pers. obs. AJC 2019), while in Arboretum des Pouyouleix in central France a tree from seed collected in Puebla in 2009 and planted in 2013 was 4 m × 9 cm in 2021 and had fruited for the first time (B. Chassé, pers. comm. 2021); at Arboretum de la Bergerette, southwestern France, a tree from seed collected in Michoacán at 2200 m and planted in 2008 withstood a severe winter in 2009–10 and had reached 5.4 m × 7.5 cm in 2016 (S. Haddock, pers. comm.). At Trompenburg Gardens and Arboretum in Rotterdam, the Netherlands, a plant was kept in a container for several years before being planted in 2015 in open ground, where it freezes back to ground level almost annually (G. Fortgens, pers. comm. 2023).

In the USA it grows in Aiken, South Carolina, where it survived a severe, late frost in 2017 (Russell 2017). At the San Francisco Botanical Garden, there are two plants of Guatemalan origin, accessioned in 2001 and 2004; the older plant is multistemmed (San Francisco Botanical Garden 2023).

It was planted by Bob Berry in Hackfalls Arboretum, New Zealand, from seed collected in 1985 in Michoacán and Morelos. The tree from Michoacán reached 12 m × 30 cm in 2004 and an estimated 20 m × 74 cm in 2020, the tallest tree in cultivation we have found a record of (Hackfalls Arboretum 2023). Berry did not speak highly of Q. castanea, criticising its branchy habit and opining it was not of good form and a rather dull species; it is worth noting that he made those remarks in 2001, and the trees seem to have developed better shape since then (Cameron 2020).

Some hybrids with other Section Lobatae species have arisen in gardens. See Quercus castanea hybrids for more details.

Quercus castanea was described in 1801 by Luis Née. The epithet castanea means chestnut-tree in Latin, presumably chosen because the leaves appeared to him to be similar to those of the chestnut. This is hardly the case, though perhaps they refer to the aristate teeth, which could be said to bear some resemblance to those on leaves of Castanea sativa. Le Hardÿ de Beaulieu and Lamant (2010) posit that, as this was among the first Mexican oaks to be described, the designation of epithets would have been simplistic at that stage.