Scientific: Fraxinus uhdei
Common: Shamel ash or evergreen ash
Family: Oleaceae
Origin: Mountain canyons of south-central Mexico just north of Mexico City into central America.

Pronounciation: FRAX-i-nus UH-dee-ii

Hardiness zones:
Sunset 9, 12-24
USDA 9 (needs cold protection when young)-11

Landscape Use: Large to massive evergreen to semi-evergreen shade tree, parks, commercial, large areas and mesic design themes. Not for small residential sites.

Form & Character: Briefly deciduous to evergreen tree (depending on winter cold in Phoenix), upright and rounded, potentially massive and stout

Growth Habit: Vigorous to 80 feet in height with a 60 feet spread.

Foliage/texture: Larger, pinnately compound green leaves, mostly 7, sometimes 9, leaflets per leaf. Leaflets are ovate to lanceolate with serrate, sometimes revolute margins, trunk and branches smooth when young becoming slightly rough with age; medium to medium coarse texture.

Flowers & fruits: Dioecious, flowers inconspicuous born on separate trees in mid winter just before or at leaf emergence, fruit a winged achene, inconspicuous.

Seasonal color: Marginal and inconsistent (from year to year depending on the weather) golden yellow early winter color.

Temperature: Freezing temperatures will defoliate most trees and can kill young twigs, injured trees recover quickly.

Light: Full sun

Soil: Tolerant

Watering: Apply regular water throughout the year.

Pruning: Elevate canopy base, not as susceptible to trunk scald like other Phoenix ash trees mainly due to greater heat tolerance and a wider canopy spread.

Propagation: Cutting or grafting

Disease and pests: None, appears resistant to ash decline.

Additional comments: Lateral buttress roots of mature specimens of Shamel ash can heave concrete. Large canopies can shade out Bermuda turf grass, Ergo, use as a lawn tree and/or around concrete walks and drives with discretion because of heavy surface roots and dense canopy shade. Note that the cultivar 'Majestic' is popular.