<i>Hydrangea </i>plant named ‘HP220901’

Abstract

A new and distinct cultivar of Hydrangea plant named ‘HP220901’, characterized by its relatively compact, upright to somewhat outwardly spreading and rounded to conical plant habit; moderately vigorous growth habit and moderate growth rate; freely branching habit with strong, thick and sturdy stems; freely and uniformly flowering habit; large inflorescences with numerous light yellow green-colored sterile flowers that become purplish red in color in the autumn; and good garden performance.

Claims

1. A new and distinct Hydrangea plant named ‘HP220901’ as illustrated and described.

Description

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

(1) The accompanying colored photographs illustrate the unique appearance of the new Hydrangea plant showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ from the color values cited in the detailed botanical description which accurately describe the colors of the new Hydrangea plant.

(2) The photograph on the first sheet (FIG. 1) is a side perspective view of a typical flowering plant of ‘HP220901’ grown in a container.

(3) The photograph on the second sheet (FIG. 2) is a side perspective view of a typical inflorescence of ‘HP220901’.

DETAILED BOTANICAL DESCRIPTION

(4) Plants used in the aforementioned photographs and in the following description were grown during the summer in 27-cm containers in an outdoor nursery in Lengerich, Germany and under cultural practices typical of commercial panicle Hydrangea production. During the production of the plants, day and night temperatures averaged 15° C. Plants of the new Hydrangea 18 months old when the photograph and description were taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2015 Edition, except where general terms of ordinary dictionary significance are used. Botanical description: Hydrangea paniculata ‘HP220901’. Parentage: Female, or seed, parent.—Proprietary selection of Hydrangea paniculata identified as code number 11-0007, not patented. Male, or pollen, parent.—Proprietary selection of Hydrangea paniculata identified as code number 11-0005, not patented. Propagation: Type cutting.—By vegetative tip cuttings. Time to initiate roots, summer.—About two weeks at temperatures about 23° C. Time to initiate roots, winter.—About 18 days at temperatures about 18° C. Time to produce a rooted young plant, summer.—About four weeks at temperatures about 23° C. Time to produce a rooted young plant, winter.—About five weeks at temperatures about 18° C. Root description.—Thick; typically whitish brown in color, actual color of the roots is dependent on substrate composition, water quality, fertilizer type and formulation, substrate temperature and physiological age of roots. Rooting habit.—Freely branching; dense. Plant description: Plant and growth habit.—Relatively compact, upright to somewhat outwardly spreading and rounded to conical plant habit; strong and sturdy stems; moderately vigorous growth habit and moderate growth rate. Plant height.—About 45 cm to 60 cm. Plant diameter or area of spread.—About 50 cm to 60 cm. Lateral branch description: Branching habit.—Freely branching habit; when pinched, about ten lateral branches develop per plant. Length, stein axis to base of inflorescence.—About 25 cm to 30 cm. Diameter.—About 5 mm. Internode length.—About 4 cm to 5 cm. Texture.—Smooth, glabrous; fully developed, woody. Aspect.—Mostly upright. Strength.—Strong, sturdy. Color.—When developing: Close to 145B. Developed: Close to 200C to 200D. Lenticels: Close to 165C. Leaf description: Arrangement.—Opposite, simple. Length.—About 7 cm to 9 cm. Width.—About 3 cm to 5 cm. Shape.—Ovate. Apex.—Acute. Base.—Obtuse. Margin.—Serrulate. Texture, upper and lower surfaces.—Rugose; pubescent. Venation pattern.—Pinnate. Color.—Developing leaves, upper surface: Close to 138A. Developing leaves, lower surface: Close to 138B. Fully developed leaves, upper surface: Close to NN137B; venation, close to 144B. Fully developed leaves, lower surface: Close to 137C; venation, close to 145C. Petioles.—Length: About 1 cm to 1.5 cm. Diameter: About 2 mm to 3 mm. Texture, upper surface: Smooth, glabrous. Texture, lower surface: Rugose, glabrous. Color, upper surface: Close to 144B tinged with close to 181B. Color, lower surface: Close to 144C tinged with close to 181C. Flower description: Flower type and habit.—Showy sterile flowers and small fertile flowers arranged on terminal panicles; panicles conical to pyramidal in shape; flowers face upright to outwardly depending on their position in the inflorescence. Fragrance.—None detected. Natural flowering season.—Plants begin flowering about 17 weeks after planting; flowering begins in the early summer and is continuous throughout the summer in Northern Europe. Flower longevity.—Fertile flowers last about one month on the plant, fertile flowers not persistent; sterile flowers last about three months on the plant, sterile flowers persistent. Quantity of flowers.—Freely flowering habit; about 150 to 200 fertile flowers develop per panicle and about 250 to 400 sterile flowers develop per panicle. Panicle height.—About 13 cm to 18 cm. Panicle diameter.—About 11 cm to 14 cm. Fertile flower buds.—Length: About 3 mm. Diameter: About 2 mm. Shape: Rounded. Color: Close to 145D. Sterile flower buds.—Length: About 3 mm. Diameter: About 2 mm. Shape: Rounded. Color: Close to 145B. Fertile flower diameter.—About 3 mm. Fertile flower depth (height).—About 3 mm. Sterile flower diameter.—About 2 cm to 3 cm. Sterile flower depth (height).—About 3 mm. Petals, fertile flowers.—Quantity and arrangement: About four or five in a single whorl. Length: About 3 mm. Width: About 2 mm. Shape: Ovate. Apex: Acute. Base: Obtuse. Margin: Entire. Texture, upper and lower surfaces: Smooth, glabrous. Color: When opening, upper and lower surfaces: Close to 145D. Fully opened, upper and lower surfaces: Close to 145D. Petals, sterile flowers.—Quantity and arrangement: About four or five in a single whorl. Length: About 2 mm to 3 mm. Width: About 2 mm. Shape: Ovate. Apex: Acute to obtuse. Base: Obtuse to cuneate. Margin: Entire. Texture, upper and lower surfaces: Smooth, glabrous. Color: When opening, upper and lower surfaces: Close to 145D. Fully opened, upper and lower surfaces: Close to 145D. Sepals, fertile flowers.—Quantity and arrangement: About four or five in a single whorl. Length: About 1 mm. Width: About 1 mm. Shape: Ovate. Apex: Acute. Base: Obtuse. Margin: Entire. Texture, upper and lower surfaces: Smooth, glabrous. Color: When opening, upper and lower surfaces: Close to 145D. Fully opened, upper and lower surfaces: Close to 145D. Sepals, sterile flowers.—Quantity and arrangement: About four or five in a single whorl. Length: About 1 cm to 1.5 cm. Width: About 1 cm to 1.5 cm. Shape: Elliptic to oval. Apex: Obtuse to acute. Base: Attenuate. Margin: Entire. Texture, upper and lower surfaces: Smooth, glabrous. Color: When opening, upper and lower surfaces: Close to 145D. Fully opened, upper and lower surfaces: Close to 145D; in the autumn, color becoming closer to 61B to 61C. Pedicels, fertile flowers.—Length: About 1 mm. Diameter: About 1 mm. Strength: Strong. Aspect: Mostly upright. Texture: Smooth, glabrous. Color: Close to 145D. Pedicels, sterile flowers.—Length: About 1 cm to 1.5 cm. Diameter: About 1 mm to 2 mm. Strength: Strong. Aspect: About 80° to 90° from branch axis. Texture: Smooth, glabrous. Color: Close to 145D. Reproductive organs, fertile flowers.—Stamens: Quantity per flower: About nine to ten. Filament length: About 3 mm. Filament color: Close to 157D. Anther length: About 1 mm. Anther shape: Round. Anther color: Close to 145D. Pollen amount: Scarce. Pollen color: Close to 145D. Pistils: Pistil quantity per flower: One. Pistil length: About 0.5 mm to 1 mm. Stigma shape: Two to three-lobed. Stigma color: Close to 145D. Style length: About 1 mm. Style color: Close to 145B. Ovary color: Close to 145B. Reproductive organs, sterile flowers.—Stamens: Quantity per flower: About nine to ten. Filament length: About 3 mm. Filament color: Close to 157D. Anther length: About 1 mm. Anther shape: Round. Anther color: Close to 157D. Pollen amount: Scarce. Pollen color: Close to 145D. Pistils: Pistil quantity per flower: One. Pistil length: About 1 mm to 2 mm. Stigma shape: Two to three-lobed. Stigma color: Close to 145D. Style length: About 1 mm to 2 mm. Style color: Close to 145D. Ovary color: Close to 145D. Seeds, only produced by fertile flowers.—Quantity per fertile flower: About 20 to 30. Length: Less than 0.5 mm. Diameter: Less than 0.5 mm. Color: Close to 200C. Pathogen & pest resistance: To date, plants of the new Hydrangea grown under commercial production conditions have not been observed to be resistant to pathogens and pests common to Hydrangea plants. Garden performance: Plants of the new Hydrangea have been shown to have good garden performance and to be tolerant to temperatures ranging from about −38° C. to about 38° C.