Scientific Name:
Fraxinus
(hybrid cvs.)
Pronunciation:
FRAK-si-nus
Common Name:
hybrid ash
Family Name:
Oleaceae
Plant Type:
Tree - deciduous
Key ID Features:
Leaves pinnately compound with 5-7(-9) lanceolate leaflets, most 10-15cm long x 2-4cm wide, turning to glowing yellow in fall. Winter ID: lateral buds rounded to ovoid, dark brown; leaf scar D-shaped below lateral bud; bundle scars tiny and in a curved line.
Habit:
Spreading, Upright
Form:
Oval - vertical
Texture:
Medium
Mature Height:
10 - 15m
Mature Spread:
10 - 15m
Growth Rate:
Moderate
Origin:
Garden origin (F. nigra x F. mandshurica)
Hardiness Rating:
Zone 3: (-40 to -34 °C)
Exposure:
Full sun
Soil/Growing Medium:
Well-drained
Water Use:
Moderate
Landscape Uses:
Fall interest, Shade tree, Specimen plant, Street (boulevard tree), Tall background
Additional Info:
Cultivars shown or on campus may include F. 'Northern Gem' and F. 'Northern Treasure'.
Leaf Morphology:
Form:
Compound
Arrangement:
Opposite
Texture/Venation:
Soft flexible
Surfaces:
Lustrous
Compound Leaf:
Odd-pinnate, Leaflets stalked
Colour in Summer:
Green, Dark-green
Colour in Fall:
Orange, Red
Shapes:
Lanceolate
Apices:
Acuminate
Bases:
Cuneate
Margins:
Serrate
Additional Info:
Spectacular fall colour
Inflorescence Type:
Flowers clustered
Flower Morphology:
Dioecious plant
Number Of Petals:
0
Ovary Position:
Superior
Colour (petals):
Not showy, Green-yellow
Flower Time at Peak:
Apr, May
Fruit Type:
Aborted (hybrids) or absent
Fruit Colour:
Brown
Fruiting Time:
Sep, Oct
Additional Info:
Fruit insignificant, Persistent, Male cultivar that does not bear fruit
Bark Morphology:
Deeply fissured
Bark or Stem Colour:
Grey
Leaf Bud Type:
Ovoid, Rounded or globular
Leaf Scar Shape:
Half-round
Pest Susceptibility:
Anthracnose, Stem borer insects (Disease resistant)
Specific Pests:
Course(s):
- HORT 2355
Location(s):
- (BCE) Boulevard (Circular) Eastend : cvs. Northern Gem, Northern Treasure (more southern of the 3 ashes)
- (WDH) Wark-Dumais House