Denomination: 'TNHEU042'
Trade name: Dolce Key Lime Pie
Botanical Name: Heuchera
Applicant/Holder: Terra Nova Nurseries, Inc.
10051 S. Macksburg Rd.
Canby, Oregon
United States of America
Breeder: Janet N. Egger, Wilsonville, 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: 04-4482
Grant of Rights Date: 2006-10-23
Certificate Number: 2564
Date rights surrendered: 2015-10-23

Variety Description

Variety used for comparison: 'Lime Rickey'

Summary: 'TNHEU042' is a Heuchera variety that has leaves with shallow sinuses between the lobes, whereas the sinuses in the leaves of 'Lime Rickey' are deeper. 'TNHEU042' has weak undulation of the leaf margins, whereas 'Lime Rickey' has strong undulation, giving the leaves a ruffled appearance. The leaf blade of 'TNHEU042' is yellow green with very light yellow green between the veins. The leaf blade of 'Lime Rickey' is yellow green but it does not have a secondary colour.


'TNHEU042' is a Heuchera variety with a mounding plant growth habit. The leaves are simple, broad ovate in general shape and weakly lobed. The leaf base is open to partly overlapping. The leaf margins are ciliate with shallow, crenate incisions. There is weak undulation of the leaf margins. Pubescence on the upper side is dense and on the lower side it is sparse to medium. The main colour on the upper side of the leaf is yellow green. However, between the veins on the upper side of the leaf blade the colour is very light yellow green. The lower side of the leaf is yellow green. The petiole of 'TNHEU042' is green with no anthocyanin colouration and sparse to medium pubescence.

Origin & Breeding History: The variety 'TNHEU042' was developed by the breeder in Canby, Oregon, U.S.A. It originated from a cross made in April 2001, between 'Amber Waves' as the female parent and the variety 'Huntsman' as the male parent. The new variety was selected in August 2002, based on foliage colour in all seasons, flower colour, and excellent plant vigour.

Tests & Trials: Tests and trials for 'TNHEU042' 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 'TNHEU042' with reference variety 'Lime Rickey'

Plant height (cm)

  'TNHEU042' 'Lime Rickey'
mean 12.5 13.2
std. deviation 1.39 1.83

Plant width (cm)

  'TNHEU042' 'Lime Rickey'
mean 31.6 26.5
std. deviation 1.61 3.75

Length of leaf blade (cm)

  'TNHEU042' 'Lime Rickey'
mean 6.8 7.0
std. deviation 0.63 0.75

Width of leaf blade (cm)

  'TNHEU042' 'Lime Rickey'
mean 6.1 6.3
std. deviation 0.47 0.41

Colour of upper side of leaf (RHS)

  'TNHEU042' 'Lime Rickey'
main 144A-B 144B-C
secondary 144C-D N/A
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