Denomination: 'UF0646'
Trade name: Redhead
Botanical Name: Plectranthus scutellarioides
Applicant/Holder: Florida Foundation Seed Producers, Inc.
P.O. Box 309
Greenwood, Florida
United States of America
Breeder: David Clark, Greenwood, United States of America
Phuong N. Nguyen, Florida Foundation Seed Producers, Inc., Greenwood, 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: 2009-03-19
Application Number: 09-6562
Grant of Rights Date: 2011-09-14
Certificate Number: 4178
Date rights surrendered: 2012-09-14

Variety Description

Variety used for comparison: 'Big Red Judy'

Summary: The plants of 'UF0646' are shorter than the plants of 'Big Red Judy'. The leaf blade of 'UF0646' is shorter than the leaf blade of 'Big Red Judy'. The upper side of the leaf blade is brown purple for 'UF0646' while it is dark reddish brown purple for 'Big Red Judy'. The petiole is longer for 'UF0646' than for 'Big Red Judy'.


PLANT: upright bushy growth habit, medium degree of branching
STEM: light green, very strong anthocyanin colouration, sparse pubescence, medium thickness, edged shape

LEAF: opposite arrangement, simple, ovate shape, acuminate apex, cuneate base, crenate margin, medium depth margin incisions, sparse pubescence on upper side, absent to very sparse pubescence on lower side
UPPER SIDE: mid rib and veins dark violet (RHS N79B), interveinal area and margin brown purple (RHS 187A)
LOWER SIDE: dark reddish brown (redder than RHS N186C)
PETIOLE: strong anthocyanin colouration.

Origin & Breeding History: The variety 'UF0646' originated as an open pollinated seed variety made at the University of Florida in Gainesville, Florida, USA in 2005. The female parent was the variety 'Elfers', characterized by its deep purple, green, red and gold multicoloured foliage, excellent vigour, heat tolerance, optimal branching habit and late flowering characteristics. The male parent is unknown. The initial selection was made in March 2006 and propagation since that time has been made through the use of vegetative cuttings. Selection criteria included stable leaf colour in sunny and shady locations and excellent vigour.

Tests & Trials: Trials for 'UF0646' were conducted in a polyhouse during the summer of 2010 in St. Thomas, Ontario. The trial included a total of fifteen plants of the candidate and reference varieties. All plants were grown from rooted cuttings and transplanted into 15 cm pots on May 5, 2010. Observations and measurements were taken from ten plants or parts of plants on June 3, 2010. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'UF0646' with reference variety 'Big Red Judy'

Plant height (cm)

  'UF0646' 'Big Red Judy'
mean 26.2 36.4
std. deviation 1.51 3.61

Leaf blade length (cm)

  'UF0646' 'Big Red Judy'
mean 11.0 12.9
std. deviation 0.81 0.68

Colour of leaf blade (RHS)

  'UF0646' 'Big Red Judy'
upper side - interveinal area 187A 187A (darker and redder than)
upper side - margin 187A 187A (darker and redder than)

Petiole length (cm)

  'UF0646' 'Big Red Judy'
mean 5.4 2.9
std. deviation 0.53 0.46

Click on image for larger view
Coleus: 'UF0646' (left) with reference variety 'Big Red Judy' (right)

Click on image for larger view
Coleus: 'UF0646' (left) with reference variety 'Big Red Judy' (right)

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