<i>Astilbe </i>plant named ‘Harvandermeerwhite’

Abstract

A new and distinct cultivar of Astilbe plant named Harvandermeerwhite, characterized by its tall, broadly upright and mounding plant habit; vigorous growth habit; dark green-colored leaves; freely and uniformly flowering habit; pure white-colored flowers on tall, upright and strong peduncles; and good container and garden performance.

Claims

1. A new and distinct Astilbe plant named Harvandermeerwhite as illustrated and described.

Description

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

(1) The accompanying colored photographs illustrate the overall appearance of the new Astilbe 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 slightly from the color values cited in the detailed botanical description which accurately describe the colors of the new Astilbe plant.

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

(3) The photograph on the second sheet (FIG. 2 of 2) is a close-up view of typical inflorescences of Harvandermeerwhite.

DETAILED BOTANICAL DESCRIPTION

(4) The aforementioned photographs and following observations, measurements and values describe plants grown during the late summer in 18-cm containers in a glass-covered greenhouse in Nieuwe Wetering, The Netherlands and under cultural practices typical of commercial Astilbe production. During the production of the plants, day temperatures ranged from 20 C. to 40 C. and night temperatures ranged from 8 C. to 24 C. Plants were one year old when the photographs 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 classification: Astilbe chinensis Harvandermeerwhite. Parentage: Female, or seed, parent.Astilbe chinensis Harvandermeer, not patented. Male, or pollen, parent.Unknown Astilbe chinensis seedling selection, not patented. Propagation: Type.By vegetative divisions. Time to initiate roots.About three weeks at temperatures about 20 C. Root description.Thick, fleshy; typically brown in color, actual color of the roots is dependent on substrate composition, water quality, fertilizer type and formulation. Rooting habit.Freely branching; dense. Plant description: Plant form and growth habit.Herbaceous perennial; tall, broadly upright and mounding plant form with inflorescences held above the foliar plane; flowering stems and leaves basal; freely flowering with numerous basal branches developing per plant, dense and bushy; vigorous growth habit; and freely and uniformly flowering habit. Growth rate.Moderately rapid; from divisions, about three months are required to produce fully-grown flowering plants in containers. Plant height (soil level to top of foliar plane).About 48.6 cm. Plant height (soil level to top of inflorescences).About 74.1 cm. Plant width (spread).About 72.8 cm. Stem description.Length: About 33.7 cm. Diameter: About 3.5 mm. Internode length: About 16.2 cm. Strength: Strong. Aspect: Erect to about 5 from vertical. Texture and luster: Moderately pubescent; slightly glossy. Color, developing: Slightly darker than 195A. Color, developed: Close to 144A. Leaf description: Arrangement.Alternate; biternately compound; on average, about 33 leaflets per leaf. Leaf length (excluding petiole).About 38 cm. Leaf width.About 29.9 cm. Terminal leaflet length.About 8.4 cm. Terminal leaflet width.About 4.3 cm. Lateral leaflet length.About 5.9 cm. Lateral leaflet width.About 2.7 cm. Leaf shape, in outline.Broadly ovate to broadly deltoid. Leaflet shape.Ovate to broadly elliptic. Leaflet apex.Apiculate to acute. Leaflet base.Short attenuate to obtuse. Leaflet margin.Biserrate; not undulate. Leaflet texture and luster, upper and lower surfaces.Moderately pubescent; slightly glossy. Leaflet venation pattern.Pinnate. Leaflet color.Developing leaflets, upper surface: Close to 137B. Developing leaflets, lower surface: Close to 147B. Fully expanded leaflets, upper surface: Close to NN137A; venation, close to 143A. Fully expanded leaflets, lower surface: Close to 147B; venation, close to 145C. Leaf petiole length.About 29.6 cm. Leaf petiole diameter.About 2.5 mm. Leaf and leaflet petiole strength.Strong. Leaf and leaflet petiole texture and luster, upper and lower surfaces.Sparsely pubescent; glossy. Leaf and leaflet petiole color, upper surface.Close to 144A; towards the base, close to 184A; at the nodes, close to 187A. Leaf and leaflet petiole color, lower surface.Close to 144A; towards the base, close to 185A; at the nodes, close to 183C. Flower description: Flower type and flowering habit.Single rotate flowers arranged on terminal compound panicles; flowers face upright, outward or downward depending on position on the inflorescence; panicles conical in shape; freely and uniformly flowering habit with about 2,000 flowers developing per inflorescence and about 20,000 flowers developing per plant during the flowering season. Fragrance.Strong; sweet and pleasant. Natural flowering season.Plants begin flowering about 13 weeks after planting; continuously flowering from late spring until late summer in The Netherlands. Postproduction longevity.Flowers last about ten days on the plant; flowers not persistent. Flower buds.Height: About 3.5 mm. Diameter: About 2 mm. Shape: Ovate. Texture and luster: Smooth, glabrous; matte. Color: Sepals, close to 145C and petals, close to NN155D. Inflorescence height.About 30.1 cm. Inflorescence diameter.About 10.8 cm. Flower diameter.About 1.1 cm. Flower depth.About 6 mm. Petals.Quantity per flower: Typically five in a single whorl. Length: About 6 mm. Width: About 1 mm. Shape: Oblanceolate. Apex: Obtuse. Base: Narrowly cuneate. Margin: Entire; not undulate. Texture and luster, upper and lower surfaces: Smooth, glabrous; matte. Color: Developing petals, upper and lower surfaces: Close to NN155D. Fully expanded petals, upper and lower surfaces: More white than NN155D; color does not change with development. Sepals.Quantity per flower: Typically five in a single whorl, lower 60% fused towards the base forming a campanulate-shaped calyx. Length: About 2.5 mm. Width: About 1.25 mm. Shape: Ovate. Apex: Acute. Base: Cuneate, fused. Margin: Entire. Texture and luster, upper and lower surfaces: Smooth, glabrous; matte. Color: Developing sepals, upper and lower surfaces: Close to 150D. Fully expanded sepals, upper and lower surfaces: Close to 155A; colors do not change with development. Peduncles.Length: About 29.3 cm. Diameter: About 2.5 mm. Angle: Mostly erect. Strength: Strong. Texture and luster: Moderately to densely pubescent; slightly glossy. Color: Close to 144A to 144B. Pedicels.Length: About 1 mm. Diameter: About 0.5 mm. Angle: About 45 from peduncle axis. Strength: Moderately strong. Texture and luster: Moderately pubescent; matte. Color: Close to 145C to 145D. Reproductive organs.Stamens: Quantity per flower: Typically ten; anthers basifixed. Filament length: About 3 mm. Filament color: Close to NN155A. Anther shape: Broadly ovate. Anther length: About 0.3 mm. Anther diameter: About 0.2 mm. Anther color: Close to 155C. Pollen amount: Scarce. Pollen color: Close to 155A. Pistils: Quantity per flower: Two. Pistil length: About 1.75 mm. Stigma diameter: About 0.1 mm. Stigma shape: Club-shaped. Stigma color: Close to 195D. Style length: About 1.5 mm. Style color: Close to 157A. Ovary color: Close to 145C. Seeds and fruits.To date, seed and fruit development have not been observed on plants of the new Astilbe. Pathogen & pest resistance: To date, plants of the new Astilbe have not been noted to be resistant to pathogens and pests common to Astilbe plants. Garden performance: Plants of the new Astilbe have been observed to have good garden performance and tolerate rain, wind, temperatures ranging from about 25 to 35 C. and to be suitable for USDA Hardiness Zones 5 through 10.