Denomination: 'Katerberg'
Botanical Name: Buxus sempervirens
Applicant/Holder: Spring Meadow Nursery, Inc.
12601 120th Avenue
Grand Haven, Michigan
United States of America
Breeder: Gerard Katerberg, Muskegon, 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: 2003-08-12
Application Number: 03-3805
Grant of Rights Date: 2006-11-28
Certificate Number: 2635
Date rights surrendered: 2017-11-28

Variety Description

Variety used for comparison: 'Green Velvet'

Summary: 'Katerberg' has strong basal branching while 'Green Velvet' has weak basal branching. 'Katerberg' has a longer leaf blade length than 'Green Velvet'. The upper side of the leaf blade is dark green for 'Katerberg' while it is medium green for 'Green Velvet'. The lower side of the leaf blade is medium green for 'Katerberg' while it is light green for 'Green Velvet'.


'Katerberg' is an evergreen boxwood variety which has a compact, bushy-rounded growth habit. 'Katerberg' has strong basal branching and medium to dense foliage. The stem is thin and edged in shape. The young shoot is light green in colour and the mature stem is tan in colour. The stem has no anthocyanin.

The leaves are opposite in arrangement and simple. They are elliptic in shape with an acute apex on new growth and obtuse to retuse apex on older growth. The leaf base is cuneate and the margin is entire. The upper side of the leaf blade has medium glossiness. There is sparse pubescence on the upper surface of the leaf and medium pubescence along the midrib. The lower side of the leaf has no pubescence. The leaf has weak fragrance. On new growth, the upper side of the leaf is brown green in colour and light green on the lower side. On older growth the leaf is dark green on the upper side and medium green on the lower side. There is no leaf variegation.

Origin & Breeding History: 'Katerberg' was discovered in 1997 in Muskegon, Michigan, USA, as a naturally occurring mutation of the variety 'Welleri'. It was selected based on its compact branching and semi dwarf, mounded habit. The new variety was first propagated by hardwood cuttings in 1997, in Muskegon, Michigan, USA.

Tests & Trials: 'Katerberg' was tested in an outdoor container trial during the summers of 2004 and 2005, in St. Thomas, Ontario. The trial included 15 plants of each variety. All shrubs were grown from 2 1/4 inch liners and planted into 2 gallon containers in May 2004. Plants were arranged in rows with approximately 1 metre spacing between plants. Observations and measurements were taken from 10 plants of each variety on August 15, 2005. All colour measurements were made using the 2001 RHS colour chart.

Comparison tables for 'Katerberg' with reference variety 'Green Velvet'

Leaf blade length (cm)

  'Katerberg' 'Green Velvet'
mean 2.5 2.1
std. deviation 0.36 0.09

Colour of leaf blade on new growth (RHS)

  'Katerberg' 'Green Velvet'
upper side 146A-B 144A
lower side 144B 144C with 2B at margin

Colour of leaf blade on mature growth (RHS)

  'Katerberg' 'Green Velvet'
upper side darker than 147A 146A
lower side 144A 144B

Click on image for larger view
Boxwood: 'Katerberg' (left) with reference variety 'Green Velvet' (right)

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