Scientific Name:
Hydrangea arborescens
Pronunciation:
hy-DRAN-jee-ah are-bore-ESS-enz
Common Name:
hills of snow, smooth hydrangea
Family Name:
Hydrangeaceae
Plant Type:
Shrub - deciduous
Key ID Features:
Leaves opposite, ovate, most blades 5-15cm long x 3-10cm wide, margin serrate, petioles 4-7cm long; corymb-like cymes 7-22cm wide, florets numerous, commonly white (pink-red cvs.). Winter ID: bark peels off in several successive thin layers with different colors.
Habit:
Upright
Form:
Vase
Texture:
Coarse
Mature Height:
1.3 - 2.0m
Mature Spread:
1.0 - 1.5m
Growth Rate:
Fast
Origin:
U.S. - northeast
Hardiness Rating:
Zone 4: (-34 to -29 °C)
Exposure:
Full sun, Part sun/part shade
Soil/Growing Medium:
Well-drained
Landscape Uses:
Group or mass planting, Mixed shrub border, Perennial border, Summer interest, Woodland margin
Additional Info:
Google. Cultivars shown and on campus may include H. ‘Grandiflora’, H. 'Incrediball', and H. 'Invincibelle Ruby' (red flowers). Other popular cultivars include H. 'Annabelle'.
Leaf Morphology:
Form:
Simple
Arrangement:
Opposite
Texture/Venation:
Soft flexible, Heavily veined, Pinnate venation
Surfaces:
Glabrous
Colour in Fall:
Yellow
Shapes:
Ovate
Apices:
Acuminate
Bases:
Cordate
Margins:
Serrate
Inflorescence Type:
Cyme, Floriferous, Corymb-like
Flower Morphology:
Flowers perfect
Number Of Petals:
5
Corolla Shape:
Rotate/stellate
Ovary Position:
Inferior
Colour (petals):
Showy, White, Red (H. 'Invincibelle Ruby' has red flowers)
Flower Time at Peak:
Jun, Jul, Aug, Sep
Fruit Type:
Capsule
Fruit Colour:
Brown
Fruiting Time:
Oct
Bark Morphology:
Exfoliating
Bark or Stem Colour:
Grey, Brown
Organ Modifications:
Runners (or stolons)
Maintenance:
Medium
Other:
Prune back stems to the ground in late winter
Pest Susceptibility:
Aphids or adelgids, Blight or needle cast, Fungal leaf spot, Mites, Mold, Rust, Scale insects (Pest resistant, Disease resistant, Deer resistant, Rabbit resistant)
Course(s):
- Level 2 Apprenticeship
Location(s):
- (GAZ) GAZebo
- (GAZW) GAZebo West : ‘Grandiflora’q.1
- (NRY) NuRserY : 'Incrediball'