Hydrangea aspera subsp. sargentiana (Sargent Hydrangea)


Michael's Opinion

H. aspera subsp. sargentiana is a broad spreading, medium to large sized shrub with pale blue and pink flowers that contrast nicely against the dark green-grey foliage. The plant will reach full size under good growing conditions in about 10 years.

Botanical Information

FamilyHydrangeaceae
GenusHydrangea
Speciesaspera
Subspeciessargentiana
SynonymsHydrangea sargentiana
CategoryWoody
TypeShrub (deciduous), Shrub (evergreen)
OriginWestern Hubei province, China. Aspera means 'rough textured' and refers to the coarse textured leaves of the plant.
Ethnobotanical Uses
Disclaimer
Used as an ornamental plant.

Details

USDA Hardiness Zone7-9
USDA Hardiness Ref.
Canadian Hardiness Zone5a-8a
Canada Hardiness Ref.
RHS Hardiness ZoneH3 – H7 (with some protection)
RHS Hardiness Ref.
Temperature (°C)-15 to 30
Temperature (°F)5 to 86
Height3 m
Spread2.5 m
GrowthFast
Flowering PeriodJuly, August, September

Description and Growing Information

ShapeA broad spreading low growing shrub.
PropagationSoftwood cuttings with bottom heat.
CultivationGrow in well drained but slightly moist soils in partial shade.
Notable SpecimensThe Royal Botanical Garden, Burlington, Ontario, Canada.
HabitatFound in dense forests in valleys and mountain slopes at elevations of 700-1800 m.
Bark/Stem DescriptionThe thick branchlets are covered with a dense, purple, semi-translucent, long, apically forked and acute hairs.
Leaf DescriptionThe 9-30 cm long by 6-16 cm wide leaves are elliptic, oblong-ovate to broadly ovate. The leaves are grey-green abaxially but upon emergence may be purple; adaxially the leaves are dark green.The thin papery leaves are slightly curved, with 8-11 secondary veins on both sides of the midvein. Leaves have a rounded to shallow cordate base, an irregularly triangualr dentate to denticulate leaf margin and an acuminate apex.
Flower DescriptionThe flowers are held in 10-16 cm wide corymbose cymes. The sterile flowers contain 4 obovate–orbicular to broadly orbicular sepals while the fertile flowers contain a campanulate calyx tube. The petals are purplish to blue-pink and are ovate.
Fruit DescriptionThe fruit capsule is 3-4 mm in diameter with a truncated apex. The ellipsoid seed are brown, slightly compressed and winged at both ends with a striately veined seed coat.
Colour DescriptionDark grey-green to light purple(emerging leaves) foliage, purple to purple-pink flowers and brown to purple-brown stems and bark.
Texture DescriptionMedium to coarse textured plant.

Photographs