Denomination: 'TNHEU044'
Trade name: Dolce Licorice
Botanical Name: Heuchera
Applicant/Holder: Terra Nova Nurseries, Inc.
10051 S. Macksburg Rd.
Canby, Oregon
United States of America
Breeder: Garry J. Gosset, Portland, United States of America
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2004-11-17
Application Number: 04-4483
Grant of Rights Date: 2006-10-23
Certificate Number: 2565
Date rights surrendered: 2014-10-23

Variety Description

Variety used for comparison: 'Black Beauty'

Summary: 'TNHEU044' is a Heuchera variety that has wider leaves than the reference variety 'Black Beauty'. The incisions in the leaf margins of 'TNHEU044' are crenate and shallow, while they are serrate and medium in depth for 'Black Beauty'. 'TNHEU044' has leaves that have a dark brown main colour, with silvery grey secondary colour between the veins, whereas 'Black Beauty' has uniformly dark brown leaves with no secondary colour. The lower side of the leaves of 'TNHEU044' are red purple, while the lower side of the leaves of 'Black Beauty' are dark brown. 'TNHEU044' also has a longer petiole than the reference variety.


'TNHEU044' is a Heuchera variety with a mounding plant growth habit. The leaves are simple, broad ovate in general shape and palmately lobed. The leaf base is closed to partly overlapping. The leaf margins are ciliate with shallow, crenate incisions. There is strong undulation of the leaf margins. Lobing is moderate. Pubescence on the upper side of the leaf blade is absent or very sparse and on the lower side it is sparse. The main colour on the upper side of the leaf is dark brown. However, there is grey secondary colour between the veins on the upper side of the leaf blade. The lower side of the leaf is red purple. The petiole of 'TNHEU044' is dark brown in colour with sparse, short pubescence.

Origin & Breeding History: The variety 'TNHEU044' originated from an open pollinated cross that took place in May 2000 in a field in Canby, Oregon, between interspecific Heuchera hybrids. Given that the new variety has silver and red in its leaves, it is assumed that it has Heuchera americana in its parentage. The new variety was selected in August 2002, based on leaf colour,winter leaf colour, and excellent plant vigour.

Tests & Trials: Tests and trials for 'TNHEU044' were conducted in a polyhouse during the spring of 2005, in St. Thomas, Ontario. The trial included a total of 15 plants of each variety. All plants were grown from rooted cuttings, transplanted into 15 cm pots on April 29, 2005. Foliage height was recorded on July 15, 2005. All other observations and measurements were taken from 10 plants of each variety on June 29, 2005. All colour measurements were made using the 2001 RHS Colour Chart.

Comparison tables for 'TNHEU044' with reference variety 'Black Beauty'

Length of leaf blade (cm)

  'TNHEU044' 'Black Beauty'
mean 12.6 10.4
std. deviation 0.83 1.29

Width of leaf blade (cm)

  'TNHEU044' 'Black Beauty'
mean 11.4 9.4
std. deviation 0.77 1.28

Colour of upper side of leaf (RHS)

  'TNHEU044' 'Black Beauty'
main 200A 200A
secondary 201B-C N/A

Colour of lower side of leaf (RHS)

  'TNHEU044' 'Black Beauty'
main redder than N79A N186C

Length of petiole (cm)

  'TNHEU044' 'Black Beauty'
mean 15.7 10.9
std. deviation 1.50 0.99
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