Heuchera plant named ‘TNHEUGB’

Abstract

A new and distinct Heuchera plant characterized by purple black to black leaf color, large leaves with slightly ruffled and rounded lobes, very light pink flowers on upright flowering stems, performing well in sun or shade, a large, tall mounding habit with an excellent crown count, and excellent vigor.

Claims

1. A new and distinct Heuchera plant as herein illustrated and described.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) FIG. 1 shows a one-year-old plant of Heuchera TNHEUGB growing in the show garden in June in Canby, Oreg.

DETAILED PLANT DESCRIPTION

(2) The following is a detailed description of the new Heuchera cultivar based on observations taken in late October of nine-month-old specimens growing in the trial field in full sun in Canby, Oreg. Canby is Zone 8 on the USDA Hardiness map. Temperatures range from a high of 95 F. in August to an average of 32 F. in January. Normal rainfall in Canby is 42.8 inches per year. The color descriptions are all based on The Royal Horticultural Society Colour Chart, 5.sup.th edition, 2007. Plant: Form.Basal rosette, herbaceous perennial. Hardiness.USDA Zone 4 to 9. Size.Grows to 30 cm tall from top of foliage to ground, 58 cm wide. Number of crowns.About 16. Habit.Large, mounding. Vigor.Excellent. Leaf: Type.Simple. Arrangement.Rosette. Shape.Broadly ovate. Number.About 160. Blade size.Grows to 16 cm long and 15.5 cm wide. Venation.Palmate. Lobing/Division.4 to 6 palmate lobes. Margins.Broadly crenate. Apex.Mucronulate. Base.Cordate, overlapping. Surface texture.Glandular-puberulent on both sides. Leaf rugosity.Slight. Petiole description.Grows to 18 cm long and 4.2 mm wide, glandular hairs; color closest to Greyed Purple N186C. Leaf color.Year round, new leaves, topside closest to Greyed Purple N186A tinted heavily with Green 137B, veins between Brown 200A and Greyed Purple N186A, bottom side closest to Purple N77B, veins closest to Purple N79B; older leaves, topside Greyed Purple N186A with veins between Brown 200A and Greyed Purple N186A, bottom side between Purple N77B and Purple N79C with veins closest to Purple N79C. Inflorescence: Size.Grows to 6.5 cm wide and 15 cm long. Type.Upright thyrse. Number of flowers per thyrse.About 90. Flower density.Medium to light. Number of thyrse.3. Peduncle.Grows to 44 cm long and 3.5 mm wide at base with glandular hairs; Greyed Purple 187A. Pedicel.Grows to 2.5 mm long, with glandular hairs; Greyed Purple 187A. Bloom period.Late August to September in Canby, Oreg. Flower bud: Size.3.5 mm wide and 5 mm long. Description.Glandular puberulent, ovoid, down facing. Color.Greyed Purple 186A on bottom half, blending to Yellow Green N144D on margins. Flower: Type.Perfect. Shape.Campanulate. Attitude.Side and down facing. Size.6.2 mm long and 4 mm wide. Corolla description.5 petals, each 3 mm long and 1 mm wide, spatulate, margins entire, tip acute, glandular-puberulent on back side, glabrous inside, White NN155 on both sides. Calyx description.Campanulate, 4 mm long and 3 mm wide; 5 lobes each 2 mm wide and 2 mm long, oblong in shape, back side glandular-puberulent, glabrous inside, tip obtuse, margin entire, outside color Greyed Purple 186A on bottom half blending to Yellow Green N144D to tip. Stamen description.5 in number, filaments 1.5 mm long, White NN155, anthers 0.3 mm long, Greyed Orange 168A, pollen none, male sterile. Pistil description.1, 2-beaked, 4 mm long and 2 mm wide, ovary 2 mm long and 2 mm wide, Yellow 4C, style 2 mm long, Yellow 4C. Fragrance.None. Lastingness.Each thyrse blooms for about 3 weeks on the plant. Seed: none seen. Pest and disease tolerance: The new cultivar is typical to the genus. No known resistances to pests or diseases. No problems have been found in Canby, Oreg.