×Heucherella plant named ‘TNHERHHL’

Abstract

A new and distinct ×Heucherella plant substantially as shown and described, characterized by solid lime green colored leaves for most of the year, distinctively lobed, palmately divided leaves, small white flowers on short flower stalks, a medium plant size with multiple crowns, and excellent vigor.

Claims

1. A new and distinct ×Heucherella plant as herein illustrated and described.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a four-month-old ×Heucherella ‘TNHERHHL’ growing in a 4″ pot in a cool greenhouse in February in Canby, Oreg.

(2) FIG. 2 shows a nine-month-old in flower growing in a one gallon container in the greenhouse in early spring in Canby, Oreg.

(3) FIG. 3 shows a one-year-old ×Heucherella ‘TNHERHHL’ in a one gallon container in the greenhouse trial bed in February in Canby, Oreg.

DETAILED PLANT DESCRIPTION

(4) The following is a detailed description of the new ×Heucherella cultivar based on observations of one-year-old specimens growing in one gallon containers in a cool greenhouse 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, fifth edition, 2007. Plant: Form.—Basal rosette, herbaceous perennial. Hardiness.—USDA Zone 4 to 9. Size.—20 cm tall from top of the foliage to the ground and 42 cm wide. Habit.—Mounding. Vigor.—Excellent. Roots.—Fibrous, freely branching, fine, and white in color. Roots develop easily from cuttings. Leaf: Type.—Simple. Arrangement.—Rosette. Shape.—Broadly ovate. Lobing/division.—5 palmate lobes, the terminal lobe the most prominent. Venation.—palmate, topside Yellow Green 145A on young leaves, Greyed Red 183A on old leaves in cold temperatures, bottom side Yellow Green 145B on young leaves, Greyed Red 183A on old leaves in cold temperatures. Margins.—Broadly crenate. Apex.—Mucronulate. Base.—Cordate. Blade size.—Grows to 10 cm long and 10.5 cm wide. Surface texture.—Glandular pubescent on both surfaces. Petiole description.—Grows to 20 cm long and 2 mm wide, glandular hairs, Yellow Green N144A with base tinted Greyed 183A; older leaves Greyed Red 183A. Leaf color.—Spring, summer, and fall topside, Yellow Green 145A, bottom side Yellow Green 145B; winter Yellow Green 145A sometimes with veins Greyed Red 183A or tinted Greyed Orange 165A overall, older leaves margins turn Greyed Red 179D. Inflorescence: Size.—Grows to 2.4 cm wide and 8 cm long. Type.—Raceme. Attitude.—Upright. Number of flowers per raceme.—About 45. Number of raceme.—30. Peduncle.—Grows to 21 cm tall, 2.5 mm wide at base, Yellow Green N144A with Greyed Red 183A, glandular hairs. Pedicel.—2.5 mm long, with glandular hairs, Yellow Green N144A. Bloom period.—April in Canby, Oreg. Flower bud: Size.—2 mm wide and 3 mm long. Description.—Glandular puberulent, ovoid. Color.—White NN155C. Flower: Type.—Imperfect. Shape.—Campanulate. Size.—4 mm deep and 5 mm wide. Attitude.—Side-facing. Petal description.—5 in number, linear, 3.5 mm long and less than 1 mm wide, tip acuminate, base attenuate, margin entire, glabrous on both sides, White NN155D on both sides. Calyx description.—4 mm deep and 5 mm wide, with 5 lobes, divided ¾ way to the base, campanulate, glandular hairs on outside, glabrous inside, tip obtuse, margin entire, NN155D on both sides. Stamen description.—10, filaments 2 mm long White NN155D, anthers Greyed Orange 164A, pollen none, sterile. Pistil description.—One central two beaked pistil, 4.5 mm long and 2 mm wide, White NN155D. Fragrance.—None. Lastingness.—Each raceme blooms for about 2 weeks on the plant. Fruit and seed: None. Disease and pest tolerance: The new cultivar is typical to the genus. No known resistances to pests or diseases. No problems have been found in Canby, Oreg.