Photo by Melody

PlantFiles: Mexican Royal Oak
Quercus germana

Family: Fagaceae (fag-AY-see-ee) (Info)
Genus: Quercus (KWER-kus) (Info)
Species: germana

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over 40 ft. (12 m)

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USDA Zone 7a: to -17.7 C (0 F)

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By victorengel
Thumbnail #1 of Quercus germana by victorengel

By victorengel
Thumbnail #2 of Quercus germana by victorengel


1 positive
1 neutral
No negatives

Gardeners' Notes:

Neutral victorengel On Feb 2, 2012, victorengel from Austin, TX wrote:

There's an interesting feature of the acorns I noticed this year. Normally, an acorn contains two cotyledons, joined by a common shoot. Q. germana acorns are not like this. They do seem to have two cotyledons, but each has its own sprout. The leaf end of the sprout is at the center by the proximal end of the acorn. The root emerges out of the side of the acorn, diagonally outward and distally from the leaf end.

Positive killdawabbit On Jul 24, 2011, killdawabbit from Christiana, TN (Zone 6b) wrote:

germana subsp eugermana A.Camus 1939 nom. inval. ;
germana var. echinata Trel. 1924
germana subsp subsquarrosa A.Camus 1935

Local names: Mexican royal oak

Range: East and N.E. Mexico; 800-1800 m;

Growth habit: reaches 25 m tall, but much smaller in cultivation;

Leaves 9-13 x 3-5 cm; persistent or semi-evergreen; oblong to oboval or oblanceolate; apex acute sometimes shortly acuminate; base rounded, sometimes cordate or auricled, often assymetrical; margin revolute, entire except near apex where they are slightly toothed; lustrous, green, glabrous above; blue-green, minutely tomentose beneath; petiole 0.5-1.5 cm long, glabrous;

Flowers: pistillate inflorescence 1-1.5 cm long, with 1 cup;

Fruits: acorn subglobose 2-4 cm long, 2,2 cm in diameter; single on a short peduncle; almost all the nut enclosed by cup; cup subglobose, warty, pubescent, 2.5-3.5 cm in diameter; maturing first year;

Bark, twigs and buds: twig greyish, glabrous, with numerous prominent lenticels; bud hairy, 3 mm long;

Hardiness zone, habitat: hardy (withstands -15 C); wet forests;

I have 3 seedlings I raised this spring '11. Very pretty and promising so far.


This plant has been said to grow in the following regions:

Folsom, Louisiana

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