Common Name: panicle hydrangea
Type: Deciduous shrub
Family: Hydrangeaceae
Zone: 3 to 8
Height: 4.00 to 6.00 feet
Spread: 4.00 to 6.00 feet
Bloom Time: July to September
Bloom Description: Lime green to white
Sun: Full sun to part shade
Water: Medium
Maintenance: Medium
Flower: Showy, Good Cut, Good Dried
Tolerate: Air Pollution
Culture
Best grown in organically rich, medium moisture, well-drained soils in full sun to part shade. Can be trained as a small single trunk tree, but is best grown as a large, multi-stemmed shrub. May display best shrub form if regularly pruned to a height of 6-10’ tall. This is one of the most winter hardy of the hydrangeas. It thrives in urban conditions. Bloom occurs on current season’s growth, so prune as needed in late winter to early spring.
Larger flower panicles can be obtained by thinning the plants to 5-10 primary shoots. In full bloom, the weight of the flower panicles will typically cause the branches to arch downward.
Noteworthy Characteristics
Hydrangea paniculata, commonly called panicle hydrangea, is a vigorous, upright, rapid-growing, somewhat coarsely textured, deciduous shrub that is native to China and Japan. It typically grows to 8-15’ (less frequently to 25’) tall, and features oval to ovate dark green leaves and upright, sharply-pointed, conical, terminal flower panicles (to 6-8” long) containing both fertile and sterile flowers (mostly non-showy fertile flowers) that bloom from mid-summer into fall.
The genus name Hydrangea comes from hydor meaning "water" and aggeion meaning "vessel", in reference to the cup-like capsular fruit.
The specific epithet paniculata refers to the arrangement of the flowers in panicles.
'Kolmakilima' is an upright selection of panicle hydrangea that features dense, cone-shaped inflorescences made up of sterile flowers that emerge bright lime green and mature to white. The terminal panicles can reach up to 14" long and are held on sturdy stems, making them excellent for use in fresh or dried arrangements. Mature plants will reach up to 6' tall with an equal spread. This plant is protected by patent number PP29853.
Problems
Some susceptibility to bud blight, bacterial wilt, leaf spot, rust and mildew. Aphids and mites are occasional visitors.
Uses
Mass or group in a mixed shrub border or open woodland garden. Also effective as a lawn specimen, accent or hedge. Provides late summer bloom when few other shrubs are in flower.