Scientific Name:
Spiraea douglasii
Pronunciation:
spy-REE-uh dug-LUS-ee-eye
Common Name:
hardhack, western spirea
Family Name:
Rosaceae
Plant Type:
Shrub - deciduous
Key ID Features:
Branches woolly, reddish-brown; leaves narrowly oblong, dark green/densely tomentose underneath, toothed at tips; flowers dense panicles, purple-pink, early summer, bowl-shaped. Winter ID: twigs reddish-brown, round with tiny ridges; buds globuar, 1-2 mm long, leaf scar v-shaped, about 1 mm wide; persistent fruit.
Habit:
Stiffly upright, Twiggy
Form:
Oval - vertical
Texture:
Medium
Mature Height:
1.3 - 2.0m
Mature Spread:
2 - 3m
Growth Rate:
Fast
Origin:
B.C. east of Cascades, B.C. west of Cascades, Canada - northern, U.S. - northwest, U.S. - southwest
Hardiness Rating:
Zone 5: (-29 to -23 °C)
Exposure:
Full sun
Soil/Growing Medium:
Acidic, Bog
Water Use:
Wetlands
Landscape Uses:
Erosion control, Summer interest, Waterside planting, Wildlife food, Woodland margin
Additional Info:
Leaf Morphology:
Form:
Simple
Arrangement:
Alternate
Texture/Venation:
Soft flexible, Pinnate venation
Surfaces:
Glabrous
Colour in Summer:
Dark-green, Pale below
Colour in Fall:
Yellow
Shapes:
Oblong
Apices:
Acute
Bases:
Attenuate
Margins:
Dentate
Additional Info:
Toothed above middle of blade, often grey-woolly beneath
Inflorescence Type:
Cyme, Floriferous, Panicle-like
Flower Morphology:
Flowers perfect
Number Of Petals:
5
Corolla Shape:
Rotate/stellate
Ovary Position:
Superior
Colour (petals):
Showy, Purple, Pink
Flower Time at Peak:
Jun, Jul
Fruit Type:
Aggregate fruit, Follicle
Fruit Colour:
Brown
Fruiting Time:
Sep, Oct
Additional Info:
Not showy, Persistent
Bark Morphology:
Smooth
Bark or Stem Colour:
Tan, Brown
Leaf Bud Type:
Rounded or globular
Leaf Scar Shape:
V-shaped
Propagation:
Seed, Softwood cuttings, Division - below ground parts
Maintenance:
Low
Pest Susceptibility:
(Pest resistant, Disease resistant)
Course(s):
- HORT 1155
Location(s):
- (ENA) Eastern North American planting
- (FSC) Far South Campus
- (GAZ) GAZebo
- (GAZS) GAZebo South
- (TFL) Turf Field Lab