Monterrey Oak (Quercus polymorpha), also known as the Mexican White Oak, is a medium to large, semi-evergreen tree with thick, leathery leaves that are dark green on top and have raised, lighter veins on the underside. It features a broad, rounded crown, rough bark, and produces acorns that mature in one year. This drought-tolerant and oak wilt-resistant species is native to Mexico and Guatemala, with a single known natural population in Texas, and is increasingly used as a landscape tree in the southwestern United States.

• Growth Habit: Medium to large, semi-evergreen tree with a broad, rounded crown that develops from a narrow, upright form in its youth 
• Mature Size: Can grow up to 40-60 feet tall with a wide spread, though some sources list potential heights up to 80 feet
• Leaves: Thick, leathery, and semi-evergreen. They are oblong, 3-5 inches long, and emerge peach-colored before maturing to a dark green, with a yellowish underside and raised veins 
• Flowers: Monoecious (male and female flowers on the same tree), borne in the spring
• Fruit: A small to medium-sized acorn that matures in one year
• Bark: Rough, developing scales and flaky plates on older trunks
• Climate: Hardy to 0°F and generally evergreen in the Phoenix area
• Drought Tolerance: Very drought tolerant
• Soil: Adapts to various soil types, including alkaline soils
• Disease Resistance: Resistant to oak wilt
• Semi-evergreen Nature: Can sometimes lose all its leaves in winter, but often retains some