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Hydrangea paniculata 'Kyushu' (Kyushu Panicle Hydrangea)

Michael's Opinion

A vigorous upright form that grows to 2.5 m with dark, glossy green leaves topped by white panicles in August. It is not drought tolerant and is suited to individual or mass planting in the shade or woodland type setting. A somewhat rare cultivar.

Botanical Information

Family	Hydrangeaceae (Saxifragaceae)
Genus	Hydrangea
Species	paniculata
Cultivar	'Kyushu'
Category	Woody
Type	Shrub (deciduous)
Origin	In 1926, softwood cuttings were taken by Captain Collingwood Ingram from a slope on a sacred volcano on Aso-San in Kyushu, Japan. He then gave cuttings to Robert and Jelana de Belder of the Kalmthout Arboretum in Belgium, where it was then distinguished and distributed as a cultivar 'Kyushu' named after Kyushu, Japan.
Ethnobotanical Uses Disclaimer	May cause upset stomach if ingested.
Pronunciation

Details

USDA Hardiness Zone	3
USDA Hardiness Ref.
Canadian Hardiness Zone	1
Canada Hardiness Ref.
RHS Hardiness Zone	H7
RHS Hardiness Ref.
Temperature (°C)	-40 - (-35)
Temperature (°F)	-40 - (-30)
Height	1.5 - 2.5 m
Spread	1 - 1.5 m
Growth	Medium
Flowering Period	July, August

Description and Growing Information

General Description	A vigorous, upright massing shrub. Yellow to dark green foliage in spring. In the summer it is covered with white panicled flowers.
ID Characteristic	A spreading to upright large shrub. White panicled flowers from late summer to early autumn. Requires little pruning. When young it can be pruned to become either a shrub or tree like form. In autumn the plant can be cut down to 30 cm from the ground to encourage plant vigour.
Shape	A spreading to upright large deciduous shrub.
Landscape	Suited to residential and commercial landscape planting as an accent or mass planting. It is additionally suited as hedges and low windbreaks or screens along seashores landscapes.
Propagation	Softwood cuttings taken from a non-flowering stems and rooted under mist with bottom heat are usually quite successful.
Cultivation	Prefers well drained acidic soil with medium moisture levels and part shade to full sun.
Pests	Grey mould, slugs, powdery mildew, aphids, hydrangea scale, rust, ringspot virus and leaf spot may be problems. Excessive sun will cause desiccation of leaves and bark.
Notable Specimens	Royal Botanical Gardens, Burlington, Ontario, Canada.
Habitat	Horticultural origin.
Bark/Stem Description	Older bark will often peel.
Flower/Leaf Bud Description	The buds are round and imbricate, globose and glabrous 4-6 scales that are brown in colour sometimes with a whorled character.
Leaf Description	Leaves are opposite and whorled on vigorous shoots. Leaves are 9-18 cm long and 5-9 cm wide. They are elliptic acuminate, rounded at the base, serrate, dark green, sparingly pubescent and nearly glaborous to smooth abaxially particularly on veins. The petiole is 1-3 cm in length.
Flower Description	White saucer shaped, whorled panicles that are 10 - 30 cm in size.
Fruit Description	Lime green open capsule.
Colour Description	Showy white flowers and dark glossy green foliage.
Texture Description	The texture is coarse year round.

Photographs

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