Hydrangea plant named 'NCHA5'

Abstract

A new and distinct Hydrangea cultivar named ‘NCHA5’ is disclosed, characterized by large, mop-head inflorescences with white sepals. Plant habit is dwarf and rounded with strong stems. Plants are triploid. The new variety is a Hydrangea normally produced as an outdoor garden or container plant.

Description

Latin name of the genus and species: Hydrangea arborescens.

Variety denomination: ‘NCHA5’.

BACKGROUND OF THE INVENTION

The present invention comprises a new and distinct hydrangea cultivar hereinafter referred to by the cultivar name ‘NCHA5’. This new Hydrangea was developed through a breeding program at North Carolina State University, Mills River, N.C.. ‘NCHA5’ was selected from a population of seedlings that resulted from a cross of Hydrangea arborescens ‘H2009-068-007’ (unpatented pollen parent) and Hydrangea arborescens ‘H2008-143-001’ (unpatented seed parent). See FIG. 1 for a complete pedigree. The first asexual propagation of ‘NCHA5’ was carried out in July 2012 by rooting stem cuttings at the North Carolina State University, Mountain Horticultural Crops Research Station, Mills River, N.C. and has been asexually reproduced repeatedly by vegetative cuttings over a two year period. ‘NCHA5’ roots readily from softwood cuttings treated with a basal dip of 2,500-5,000 ppm indole butyric acid (potassium salt) in water. ‘NCHA5’ has been found to retain its distinctive characteristics through successive asexual propagations.

SUMMARY OF THE INVENTION

The following are the unique combination of characteristics of this new cultivar when grown under standard horticultural practices at North Carolina State University, Mountain Horticultural Crops Research Station, Mills River, N.C.

• • 1. Large mop-head inflorescences with white florets.
  • 2. Triploid cytotype.
  • 3. Dwarf, rounded habit with strong stems.

COMPARISON WITH COMMERCIAL CULTIVARS

Table 1 shows distinguishing characteristics between ‘NCHA5’ and other cultivars of H. arborescens. ‘NCHA5’ has a unique combination of traits including large inflorescenses with white sepals, a dwarf habit, and a triploid cytotype.

TABLE 1
Comparison to other cultivars.
Trait	Taxa
	H. arborescens	H. arborescens	H. arborescens	H. arborescens	H. arborescens
	‘NCHA1’	‘NCHA5’	‘NCHA7’	‘NCHA8’	‘PIIHA-I’
	(USPP 20,765)		(filed	(filed	(USPP 21,227)
			concurrently)	concurrently)
Ploidy level	Diploid	Triploid	Triploid	Triploid	Unknown
(genome size,	(2.7)	(3.9)	(3.9)	(3.9)
pg)
Growth habit	Rounded	Rounded,	Rounded	Rounded	Upright,
		dwarf			spreading
Height and	100 cm × 100	35 cm × 55 cm	80 cm × 80 cm	60 cm × 60 cm	90 cm × 90 cm
width	cm
Stem	5 to 15 cm	Avg. 7 cm	Avg. 6 cm	Avg. 7 cm	About 6 cm
internode		(4 to 10.5 cm)	(4 to 7 cm)	(3 to 10 cm)
length
Flower count
Fertile	Approx. 600	Approx. 450	Approx. 50	Approx. 500	Approx. 75
Sterile	Approx. 600	Approx. 900	Approx. 200	Approx. 300	Approx. 300
Corymb	8-20 cm	Avg. 16 cm	Avg. 14 cm	Avg. 14 cm	Avg. 12.5 cm
diameter
Sepal color
Above	Red-Purple	White (155A)	Red-Purple	Yellow-Green	Close to Red-
	(ranges from	to White	(60C)	(145C) fading	Purple (58A)
	68D/C to	(N155D)		to Green-
	N66D/N66C)			White (157C)
Below	Red-Purple	White (155A)	Red-Purple	Yellow-Green	Close to Red-
	(ranges from	to White	(60A)	(145D)	Purple (63A)
	68D/C to	(N155D)
	N66D/N66C)
Sepal
Length	0.5-0.7 cm	Avg. 0.5 cm	Avg. 0.8 cm	Avg. 0.5 cm	0.7 cm
Width	0.3-0.5 cm	Avg. 0.4 cm	Avg. 0.8 cm	Avg. 0.3 cm	0.5 cm

BRIEF DESCRIPTION OF THE DRAWINGS

This new hydrangea 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 hydrangea.

FIG. 1 Shows the pedigree of ‘NCHA5’.

FIG. 2 Shows the inflorescence and plant form of a two-year-old plant of ‘NCHA5’ growing in Mills River, N.C.

FIG. 3 Shows the white mop-head inflorescence of a two-year-old plant of ‘NCHA5’ growing in Mills River, N.C.

DETAILED BOTANICAL DESCRIPTION

The following is a detailed description of the botanical characteristics of the new and distinct hydrangea variety plant known by the denomination ‘NCHA5’. The detailed description was taken on a two-year-old field-grown plant in Mills River, N.C. in 2016. All colors cited herein refer to The Royal Horticultural Society Colour Chart (The Royal Horticultural Society (R.H.S.), London, Sixth Edition, 2015). Where specific dimensions, sizes, colors, and other characteristics are given, it is to be understood that such characteristics are approximations or averages set forth as accurately as practicable.

• Classification:
  • • Botanical name.—Hydrangea arborescens ‘NCHA5’.
    • Common name.—Smooth Hydrangea.
• Parentage: ‘NCHA5’ originated as a seedling that resulted from a cross of H. arborescens ‘H2009-068-007’ and H arborescens ‘H2008-143-001’.
• Plant:
  • • Growth habit.—Rounded.
    • Height (from top of soil including inflorescences).—About 35 cm.
    • Width (including inflorescences).—About 55 cm.
    • Shoot and stem.—Length: 30 cm (20 to 35 cm). Diameter: 0.6 cm (0.3 to 0.8 cm). Internode length: 7 cm (4 to 10.5 cm). Immature shoot texture (current year): Pubescent. Immature shoot color (current year): Yellow-Green (146C). Mature stem texture (from prior year): Glabrous, exfoliating. Mature stem color (from prior year): Grey-Brown (199D).
    • Branching habit.—Freely branching with 30-50 shoots.
• Foliage:
  • • Type.—Simple.
    • Persistence.—Deciduous.
    • Arrangement.—Opposite.
    • Shape.—Broadly ovate.
    • Apex.—Acuminate.
    • Base.—Acute to rounded.
    • Venation.—Pinnate, opposite to subopposite.
    • Vein color.—Upper: Yellow-Green (148B). Lower: Yellow-Green (148D).
    • Margins.—Dentate to serrate.
    • Texture.—Upper surface: Slightly pubescent. Lower surface: Slightly pubescent.
    • Emerging leaves.—Color: Upper and lower: Green (136B).
    • Mature leaves during growing season.—Color: Upper: Green (137A). Lower: Yellow-Green (146A to 146B). Length of lamina: Avg. 8.5 cm (5.5 to 11 cm). Width: Avg. 7.5 cm (4 to 10.5 cm).
    • Leaf attachment.—Petiolate.
    • Petiole.—Length: Avg. 1.5 cm (0.5 to 2 cm). Diameter: Avg. 0.2 cm (0.1 to 0.3 cm). Color: Yellow-Green (146C).
• Inflorescence:
  • • Description.—Fertile (approximately 450) and sterile (approximately 900) flowers arranged on individual hemispherical or dome-shaped terminal, compound corymbs.
    • Flowering season.—Late May to late June in Mills River, N.C.
    • Corymb.—Diameter: Average 16 cm (12 to 19 cm). Height: Average 8 cm (6 to 10 cm). Quantity: Often 50 corymbs per plant over the flowering season. Longevity: Showy for approximately 4 weeks.
    • Sterile flowers.—Petals, pistils and stamens are greatly reduced (<0.5 mm) and insignificant. Buds: Shape: Oval. Diameter: 0.2 cm. Color: Yellow-Green (148D). Sepals: Number: 2 to 4. Length: Avg. 0.5 cm (0.3 to 0.7 cm). Width: Avg. 0.4 cm (0.3 to 0.5 cm). Shape: Ovate. Apex: Mucronate to rounded. Base: Rounded. Margin: Entire. Texture: Glabrous. Color: Upper: White (155A) to White (N155D). Lower: White (155A) to White (N155D).
    • Fertile flowers.—Sepals and petals are greatly reduced (<0.5 mm) and insignificant. Buds: Shape: Round. Diameter: 0.2 cm. Color: Yellow-Green (148C). Width: 0.2 cm. Height: 0.2 cm.
• Reproductive organs:
  • • Gynoecium.—Pistil number: 2, fused. Pistil color: White (155B). Pistil length: 0.1 cm. Stigma shape: Blunt. Stigma diameter: 0.05 cm. Style length: 0.1 cm. Ovary shape: Rounded. Ovary diameter: 0.1 cm.
    • Androecium.—Stamen number: 10. Anther: Shape: Rounded, fusiform. Length: 0.05 cm. Color: White (158D). Filament: Length: 0.1 cm. Color: White (158D). Amount of pollen: None observed.
• Other characteristics:
• Fruit/seed set: Seeds are minute, dust-like.
• Disease and Insect Resistance: No significant resistance nor susceptibility to disease or insect pests have been observed.
• Cold hardiness: At least USDA zone 6b; testing has not been completed in colder zones.

Claims

1. A new and distinct cultivar of Hydrangea arborescens plant named ‘NCHA5’ as illustrated and described herein.