Denomination: 'MAK20'
Trade name: Tuff Stuff
Botanical Name: Hydrangea macrophylla
Applicant/Holder: Spring Meadow Nursery, Inc.
12601 120th Avenue
Grand Haven, Michigan
United States of America
Breeder: Timothy D. Wood, Spring Lake, 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: 2011-08-19
Application Number: 11-7355
Grant of Rights Date: 2013-06-19
Certificate Number: 4527
Grant of Rights Termination Date: 2031-06-19

Variety Description

Variety used for comparison: 'Lynn' (Let's Dance Starlight)

Summary: The leaf blade of 'MAK20' is dark green while the leaf of 'Lynn' is medium green. The sterile flower of 'MAK20' has strong overlapping of the sepals while the sterile flower of 'Lynn' has weak to medium overlapping of the sepals. The sterile flower of 'MAK20' is blue pink when fully opened while the sterile flower of 'Lynn' is blue pink with tones of darker blue pink. The fertile flowers of 'MAK20' are pink and purple while the fertile flowers of 'Lynn' are white and purple.


PLANT: non-climbing, upright growth habit
STEM: no fasciation, green with purple colour on upper stem, lenticels dark red

LEAF BLADE: no lobing, elliptic, medium length tip, obtuse and rounded base, medium depth of incisions, no variegation, dark green, absent or weak glossiness, weak blistering

INFLORESCENCE: flattened shape, sterile flowers in one whorl, very conspicuous fertile flowers, flowers early
STERILE FLOWER: single, strong overlapping of sepals, margin incisions present on some sepals, newly opened sepal duller than blue pink (RHS 67C) with yellow green secondary colour at base, fully opened sepal blue pink (RHS 72C-D)
FERTILE FLOWER: petals pink and purple.

Origin & Breeding History: The variety 'MAK20' originated from an open pollinated cross made in Grand Haven, Michigan, USA in 2005. The female parent was the variety 'Maiko' and the male parent was unknown. The new cultivar was selected in 2009 based on criteria for re-blooming, attractive flowers, compact well branched mounding habit and good branching. Asexual reproduction by softwood cuttings was first conducted in June 2009.

Tests & Trials: Trials for 'MAK20' were conducted during the spring of 2012, in St. Thomas, Ontario. The trial included a total of 10 plants of each variety. All plants were grown from quick turn liners transplanted into 13 litre containers in June 2011. Observations and measurements were taken from 10 plants of each variety on May 18, 2012. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison table for 'MAK20' with reference variety 'Lynn'

Colour of sterile flower (RHS)

  'MAK20' 'Lynn'
newly opened 67C (duller than) 68B with N66C tones
fully opened 72C-D 68B with N66C tones

Click on image for larger view
Hydrangea: 'MAK20' (left) with reference variety 'Lynn' (right)

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Hydrangea: 'MAK20' (left) with reference variety 'Lynn' (right)

Click on image for larger view
Hydrangea: 'MAK20' (left) with reference variety 'Lynn' (right)

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