<i>Hydrangea </i>plant named ‘SMNHMP’

Abstract

A new and distinct cultivar of Hydrangea plant named SMNHMP is disclosed, characterized by floriferous plants with strong stems producing extra-large inflorescences. Plants rebloom and are hardy in USDA Zones 5 through 9. Plants respond to commercial bluing treatment, inflorescences can be bright pink or purple-violet, depending upon culture. The new variety is a Hydrangea, normally produced as an ornamental plant.

Claims

1. A new and distinct cultivar of Hydrangea plant named SMNHMP as herein illustrated and described.

Description

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

(1) SMNHMP is illustrated by the accompanying photographs which show the plant's form, foliage, and inflorescences. The colors shown are as true as can be reasonably obtained by conventional photographic procedures. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description, which accurately describe the colors of the new hybrid Hydrangea. Age of the plants photographed is between 2 to 3 years.

(2) FIG. 1 shows plants of SMNHMP grown in a greenhouse in Grand Haven, Mich. in 2019. The plant on the left of the photo has been treated with a typical acidic bluing (aluminum sulfate) treatment. The plant to the right has not been given the bluing treatment. Plant form is illustrated as well.

(3) FIG. 2 shows the mature flower color of a container-grown plant, treated with bluing treatment, grown in a greenhouse in Grand Haven, Mich. in 2019.

(4) FIG. 3 shows the mature flower color of a container-grown plant, treated without bluing treatment, grown in a greenhouse in Grand Haven, Mich. in 2019.

DETAILED BOTANICAL DESCRIPTION

(5) In the following description, color references are made to The Royal Horticultural Society Color Chart 2015 except where general terms of ordinary dictionary significance are used. The following observations and measurements describe SMNHMP plants grown in a commercial poly greenhouse in Grand Haven, Mich. under natural lighting. Measurements were taken during Summer of 2019. The plants were about 4 years old planted in the ground. The growing temperature ranged from 5 C. to 27 C. Measurements and numerical values represent averages of typical plant types. Botanical classification: Hydrangea macrophylla SMNHMP.

PROPAGATION

(6) Time to initiate roots: Approximately 18 days. Time to produce a rooted young plants: Approximately 60 days. Propagation method: Softwood cuttings.

PLANT

(7) Plant type: Flowering deciduous perennial shrub. Age of plant described: Approximately 2 to 3 years old. Growth habit: Upward and a little outward. Overall plant shape: Rounded. Height: 41 cm. Plant spread: 66 cm. Growth rate: Good. Plant vigor: Good. Branching habit: Basal, some pinching required. Length of primary lateral branches: 38 cm. Diameter of lateral branches: 6 mm. Quantity of lateral branches: 15 to 20. Stem: Stem shape.Round. Stem strength.Strong. Color.Immature: RHS Green 143B. Mature: RHS Green 143B. Pubescence.None. Aspect.15 to 45. Internode length: 5 cm. Lenticels: Color.RHS Greyed-Orange 165A. Root description: Moderately dense, thick main roots with fine, fibrous secondary roots. Main roots colored near Brown 200D, secondary roots near Yellow-White 158D.

FOLIAGE

(8) Leaf: Arrangement.Opposite. Leaf shape.Ovate. Average length.9.5 cm. Average width.6.5 cm. Apex.Cuspidate. Base.Cuneate. Margin.Serrate. Texture of top surface.Leathery. Texture of bottom surface.Leathery, ribbed. Leaf pubescence.None. Color.Young foliage upper side: Near RHS Green 137A. Young foliage under side: RHS Green 138B. Mature foliage upper side: RHS Green 139A. Mature foliage under side: RHS Green 139C. Venation.Pattern: Pinnate. Color upper side: RHS Green 139C. Color under side: RHS Yellow-Green 143D. Petiole.Average Length: 1.2 cm. Diameter: 5 mm. Petiole color upper side: RHS Green 139C. Petiole color lower side: RHS Green 143D. Petiole Texture upper side: Smooth, slightly pubescent. Petiole Texture lower side: Slightly pubescent.

FLOWER

(9) Natural flowering season: Summer. Inflorescence: Type.Mophead. Quantity of flowers per inflorescence.Fertile flowers: About 25. Sterile flowers: 50 to 150. Persistent or self-cleaning.Self-cleaning, after several weeks. Longevity.Individual flowers stay fresh on the plant for about 2 weeks. Inflorescences are ornamental for several weeks. Fragrance.None detected. Panicle: Shape.Dome. Height.8 cm. Diameter.17 cm. Sterile flower: Bud shape.Obovate. Bud length.3 mm. Bud diameter.3 mm. Bud color.RHS Yellow-Green 145D. Flower aspect.Upright and outward. Flower shape.Round. Flower length.3.5 cm. Flower diameter.3.5 cm. Persistence.Self-cleaning. Sterile flower petals: Petal arrangement.Whorl. Quantity.4. Length of petal.4 mm. Width of petal.3 mm. Apex.Acute. Shape of petal.Ovate. Petal margin.Entire. Petal base.Truncate. Petal texture.Smooth, upper and under side. Color.Upper surface at first opening: Acidic: RHS Blue 106B. Basic: RHS Purple 75C. Under surface at first opening: Acidic: RHS Blue 106B. Basic: RHS Purple 75C. Upper surface at maturity: Acidic: RHS Blue 106B. Basic: RHS Purple 75C. Under surface at maturity: Acidic: RHS Blue 106B. Basic: RHS Purple 75C. Sterile flower sepal: Arrangement.Whorl. Number.4. Shape.Obovate. Tip.Obtuse. Base.Cuneate. Margin.Entire. Length.2 cm. Width.2 cm. Texture, upper.Smooth. Texture, lower.Smooth. Color.Upper surface at first opening: RHS Yellow-Green 149C. Under surface at first opening: RHS Yellow-Green 149C. Upper surface at maturity: Acidic: RHS Purple-Violet N80B. Basic: RHS Red-Purple 67B. Under surface at maturity: Acidic: RHS Purple-Violet N80C. Basic: RHS Red-Purple 67B, lightly streaked 67D. Sterile flower pedicel: Length.1.5 cm. Diameter.2 mm. Angle.45. Strength.Good. Texture.Smooth, pubescent. Color.Acidic: RHS Violet-Blue 96C. Basic: RHS Red-Purple 73A. Fertile flower: Bud shape.Obovate. Bud length.4 mm. Bud diameter.34 mm. Bud color.Acid treatment: Near RHS Violet-Blue 98C. Basic treatment: near RHS Red-Purple 73C. Texture.Glabrous. Flower: Shape.Star-shaped. Length.1.3 cm. Depth.4 mm. Diameter.1.3 cm. Flower aspect.Upright, outward. Persistence.Self-cleaning. Longevity.1 to 2 weeks. Fertile flower petals: Arrangement.Whorl. Quantity.5. Length of petal.5 mm. Width of petal.2 mm. Apex.Acute. Shape of petal.Ovate. Petal margin.Entire. Petal base.Cuneate. Petal texture.Smooth, upper and under side. Color.Upper surface at first opening: RHS Yellow-Green 145B. Under surface at first opening: RHS Yellow-Green 145B. Upper surface at maturity: Acidic: RHS Violet-Blue 91B. Basic: RHS Red-Purple 63C. Under surface at maturity: Acidic: RHS Violet-Blue 91B. Basic: RHS Red-Purple 63C. Fertile flower sepal: None. Fertile flower pedicel: Angle.45. Strength.Good. Length.5 mm. Width.1 mm. Texture.Smooth. Color.Acidic: RHS Violet-Blue 96C. Basic: RHS Red-Purple 73A.

REPRODUCTIVE ORGANS

(10) Sterile flowers: Stamens: Number.7. Filament length.1 mm. Filament color.RHS Red-Purple 73D. Anthers: Shape.Round. Length.5 mm. Color.RHS White 155B. Pollen.Amount: Scant to moderate. Color: RHS White 155B. Pistil: Number.2. Length.0.5 mm. Stigma.Shape: Lobed. Color: RHS Red-Purple 73D. Style.Length: 0.5 mm. Color: RHS Red-Purple 73D. Fertile flowers: Stamens: Number.10. Filament length.2 mm. Filament color.RHS White 155B. Anthers: Shape.Round. Length.1 mm. Color.RHS White 155B. Pollen color.RHS White 155B. Pollen amount.Scant to moderate. Pistil: Number.3. Length.1 mm. Style.Length: 0.5 mm. Color: RHS White NN155B. Ovary color: RHS White NN155B. Stigma.Shape: Lobed. Color: RHS White NN155B.

OTHER CHARACTERISTICS

(11) Seeds and fruits: None observed. Disease/pest resistance: Neither resistance nor susceptibility to normal diseases and pests of Hydrangea have been observed. Temperature tolerance: USDA Zones 4 to 9.