Patent Publication Number: US-2019183002-P1

Title: Hydrangea plant named &#39;JON02&#39;

Description:
Latin name of the genus and species:  Hydrangea macrophylla.    
     Variety denomination: ‘JON02’. 
     BACKGROUND OF THE INVENTION 
     The new  Hydrangea  cultivar is a product of a planned breeding program conducted by the inventor, Jos de Jong in the Netherlands. The objective of the breeding program was to identify new  Hydrangea  varieties with darker foliage. The mutation resulting in the new variety was discovered by the inventor during August of 2012 at a commercial nursery in the Netherlands. 
     The parent is the unpatented commercial variety  Hydrangea macrophylla  ‘Black Diamond Baroque Angel’. The inventor grew large quantities of plants of the parent variety and selected for branch naturally occurring mutations with darker foliage and different flower colors. 
     Asexual reproduction of the new cultivar ‘JON02’ by softwood cuttings was first performed during the Summer of 2012 at a commercial greenhouse in the Netherlands. Subsequent propagation has shown that the unique features of this cultivar are stable and reproduced true to type in 2 successive generations. 
     SUMMARY OF THE INVENTION 
     The cultivar ‘JON02’ has not been observed under all possible environmental conditions. The phenotype may vary somewhat with variations in environment such as temperature, day length, and light intensity, without, however, any variance in genotype. 
     The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘JON02’. These characteristics in combination distinguish ‘JON02’ as a new and distinct  Hydrangea  cultivar:
         1. Mop-head inflorescence.   2. Compact plant form.   3. Well branched growth habit.   4. Deep, vibrant pink colored inflorescence.   5. Dark green foliage prominently flushed dark purple.       

     PARENT COMPARISON 
     Plants of the new cultivar ‘JON02’ are similar to plants of the parent in most horticultural characteristics, however, plants of the new cultivar ‘JON02’ differ in the following:
         1. The new variety has darker foliage than the parent variety, with more purple flushing.       

     COMMERCIAL COMPARISON 
     ‘JON02’ can be compared to the commercial variety  Hydrangea  ‘Jon03’, filed concurrently. These varieties are similar in most horticultural characteristics; however, ‘JON03’ differs in the following:
         1. ‘Jon02’ has brighter, darker pink flowers than ‘Jon03’.       

     ‘JON02’ can be compared to the commercial variety  Hydrangea  ‘Jon04’, filed concurrently. These varieties are similar in most horticultural characteristics; however, ‘JON02’ differs in the following:
         1. ‘Jon02’ has deep bright pink flowers, ‘Jon04’ has nearly red flowers.       

    
    
     
       BRIEF DESCRIPTION OF THE PHOTOGRAPH 
       The accompanying photograph illustrates in full color a typical flowering plant of ‘JON02’ grown in a greenhouse in the Netherlands. Age of the plant photographed is approximately 1.5 years. The photograph was taken using conventional techniques and although colors may appear different from actual colors due to light reflectance it is as accurate as possible by conventional photographic techniques. 
     
    
    
     DETAILED BOTANICAL DESCRIPTION 
     In the following description, color references are made to the 2007 Royal Horticultural Society Colour Chart except where general terms of ordinary dictionary significance are used. The following observations and measurements describe ‘JON02’ plants grown in a greenhouse, in the Netherlands. The growing temperature ranged from approximately 18° C. to 27° C. daytime and 5° to 10° C. at night. Measurements and numerical values represent averages of typical plant types. Measurements were taken during July of 2017.
     Botanical classification:  Hydrangea macrophylla  ‘JON02’.   Propagation:
             Time to initiate roots.— Approximately 16 to 28 days at approximately 22 to 27 ° C.     Root description.— Thick and fine, freely root branching and dense, fibrous. White to tan, not accurately measured with the R.H.S. chart.     Propagation method.— Softwood cuttings.       
       Plant:
             Age of plant described.— About 8 months.     Pot size.— 1 gallon.     Growth habit.— Flowering perennial shrub. Upright, non-climbing.     Overall plant shape.— Round.     Height.— About 30 to 33 cm.     Plant spread.— About 35 to 45 cm.     Growth rate.— Moderate.     Plant vigor.— Moderate.     Branching characteristics.— Opposite, basal branches, some pinching required. Non-fasciated.     Length of lateral branches/stems.— Approximately 15 to 30 cm on an 8 month old plant.     Number of lateral branches.— Varies, depending upon pinching. On average 8 on an 8 month old plant.     Diameter of lateral branches.— 6 mm.     Lateral branch shape and appearance.— Round.     Lateral branch strength.— Good.     Internode length.— Average 5 to 7 cm.     Branch/stem color.— Immature: Near RHS Yellow-Green 144C, faint flushing at nodes near Greyed-Purple N186A. Mature: Near RHS Green 139A flushed Greyed-Purple N186A.     Branch/stem texture.— Glabrous, lenticels not observed.     Branch angle.— 0 to about 30°.     Branch pubescence.— No.       
       Foliage:
             Leaf.— Arrangement: Opposite. Average Length: 10 to 15 cm. Average Width: 7 to 8 cm. Shape of blade: Ovate, without lobes. Apex: Acute. Base: Rounded to broad tapered. Margin: Crenate. Texture and appearance of top surface: Leathery, slightly glossy. Texture and appearance of bottom surface: Matte, reticulate veins. Color: Solid, non-variegated. Young foliage upper side: Near RHS Green 139A flushed Greyed-Purple N186B. Young foliage under side: Near RHS Green 137A. Mature foliage upper side: Near RHS Greyed-Green N189B, flushed Greyed-Purple 187A. Mature foliage under side: Near RHS Green 137A. Venation: Type: Pinnate. Venation color upper side: Near RHS Yellow-Green 144C. Venation color under side: Near Yellow-green 145A.     Petiole.— Average Length: 2.0 cm. Diameter: 7 mm. Color: Upper side: Near RHS Yellow-green 145A. Under side: Near RHA Yellow-green 145B. Texture upper side: Glossy, glabrous. Texture under side: Glossy, glabrous.       
       Flower:
             Bloom period.— Natural Season: June to October in the Northern hemisphere.     Inflorescence.— Arrangement: Terminal corymb. Commercial Type: Mophead. Inflorescence shape: Flattened sphere. Panicle Height: 5 to 9 cm. Panicle Diameter: 12 to 18 cm. Quantity of flowers per inflorescence: Fertile flowers not observed to date. Sterile Flowers: 12 to 24 average range. Persistent or self-cleaning: Persistent. Fragrance: None.     Sterile flower.— Bud shape: Obovate. Bud length: 7.0 mm. Bud diameter: 6.0 mm. Bud color: Near RHS Yellow-Green 1454C flushed Red-Purple 61A. Flower aspect: Upright and outward. Flower shape: Cruciform if 4 sepals, slightly overlapping whorl if 5 sepals. Flower Diameter: Average range 30 to 40 mm. Flower Depth: 20 mm. Aspect: Flat with and slightly upwardly cupped.     Sterile flower sepals.— Sepal Arrangement: Cruciform if 4 sepals, slightly overlapping whorl if 5 sepals. Sepal Number: 4 or 5. Length of sepal: Approximately 2.1 to 2.5 cm. Width of sepal: Approximately 1.5 cm. Angel of Attachment/Aspect: Sepals angled upward approximately 15° to 35° from point of attachment. Sepals upwardly cupped. Apex: Rounded. Shape of sepal: Broad rounded deltate. Sepal margin: Serrate or crenate. Sepal Base: Obtuse. Sepal Texture: Smooth, upper and under sides. Color: Upper surface at first opening: Near RHS Red-Purple 61B. Upper surface at maturity: Near RHS Red-Purple 58B. Under surface at first opening: Near RHS Red-Purple 61B. Under surface at maturity: Near RHS Red-Purple N57C. Color when fading: Upper and lower surfaces: Near RHS Red-Purple 59D.     Sterile flower petal.— Not observed.     Sterile flower pedicel.— Length: 10 to 20 mm. Diameter: 1 mm. Angle: Upright and outward. Strength: Flexible, not prone to breakage. Texture: Smooth. Color: Near RHS Yellow-Green 146A.     Fertile flower.— Not observed to date.       
       Reproductive organs:
             Sterile flower.— All reproductive parts irregular and malformed, reduced to less than 1 mm or not present.       
       Other characteristics:
             Disease resistance.— Neither resistance nor susceptibility to diseases or pests has been observed in this variety.     Cold tolerance.—− 24° C. to 38° C.     Fruit/seed production.— Not observed to date.