Prairie Skyrise

Aspen, Trembling

Denomination: 'Prairie Skyrise'
Botanical Name: Populus tremuloides
Applicant/Holder: Bron and Sons Nursery Company
3315 Carson Road
Grand Forks, British Columbia
V0H1H1
Canada
Breeder: Vince Bron, Bron and Sons Nursery Company, Grand Forks, British Columbia
Application Date: 2012-04-10
Application Number: 12-7590
Grant of Rights Date: 2013-08-01
Certificate Number: 4582
Grant of Rights Termination Date: 2031-08-01

Variety Description

Varieties used for comparison: Populus tremuloides and Populus tremula 'Erecta'

Summary: 'Prairie Skyrise' has a fastigiate growth habit whereas it is broad upright in the species. Branching density of 'Prairie Skyrise' is medium to dense whereas it is sparse to medium on 'Erecta'. The growth rate of 'Prairie Skyrise' is medium whereas it is fast in the species and slow in 'Erecta'. The colour of dormant one year old shoots of 'Prairie Skyrise' is grey brown whereas it is dark green on the species and dark green with fine grey stripes on 'Erecta'. The leaves of 'Prairie Skyrise' are longer than those of both reference varieties and wider than those of the species. In spring, the main colour of the foliage of 'Prairie Skyrise' is light green whereas it is medium green on the species and red on 'Erecta'. 'Prairie Skyrise' has strong waviness of the leaf margin whereas it is weak on the species. The leaf petiole of 'Prairie Skyrise' is shorter than that of the species. 'Prairie Skyrise' breaks bud 7 to 10 days earlier than 'Erecta'.

Description:

PLANT: fastigiate growth habit, dense branching, medium growth rate

DORMANT ONE YEAR OLD SHOOT: grey brown, absent or very sparse pubescence, rounded shape in cross-section, smooth bark, absent or very weak glaucosity, few lenticels, no thorns/spines
VEGETATIVE BUD: small, brown, ovoid, pointed apex, absent or very sparse pubescence, very small scale size

LEAF: ovate, cuspidate apex, cordate base, serrate margins, no lobes, absent or very sparse pubescence on upper and lower surfaces, light green on upper side of young leaf, medium to dark green on upper side at mid-season, yellow in the fall, no variegation, weak rugosity, strong waviness of margin
PETIOLE: strong anthocyanin colouration on upper surface

Origin & Breeding History: 'Prairie Skyrise' was discovered in 2009 at Bron & Sons Nursery, Grand Forks, British Columbia as an entire tree mutation in a production block of Populus tremuloides. It was selected for its uniform, compact, columnar growth habit and its distinct foliage. It was first reproduced by tissue culture in July 2010 in Kelowna, British Columbia.

Tests & Trials: The tests and trials for 'Prairie Skyrise' were conducted at Bron & Sons Nursery, Grand Forks, British Columbia during the 2012 growing season. There were a minimum of 10 plants per variety, planted in 30 litre containers. Measured characteristics were based on 10 measurements of each variety.


Comparison tables for 'Prairie Skyrise' with reference varieties Populus tremuloides and Populus tremula 'Erecta'

Plant height (cm)

  'Prairie Skyrise' Populus tremuloides Populus tremula 'Erecta'
mean 221 291 195
std. deviation 11.12 41.00 15.44

Plant width (cm)

  'Prairie Skyrise' Populus tremuloides Populus tremula 'Erecta'
mean 43.5 88.1 35.9
std. deviation 7.76 22.23 5.72

Leaf blade length (cm)

  'Prairie Skyrise' Populus tremuloides Populus tremula 'Erecta'
mean 9.46 6.92 6.92
std. deviation 1.52 1.00 0.94

Leaf blade width (cm)

  'Prairie Skyrise' Populus tremuloides Populus tremula 'Erecta'
mean 7.98 6.49 7.98
std. deviation 1.15 0.96 1.39

Petiole length (cm)

  'Prairie Skyrise' Populus tremuloides Populus tremula 'Erecta'
mean 2.4 3.7 2.6
std. deviation 0.58 0.59 0.50

Click on image for larger view
Prairie Skyrise
Aspen, Trembling: 'Prairie Skyrise' (right) with reference varieties 'Erecta' (left) and Populus tremuloides (centre)

Click on image for larger view
Prairie Skyrise
Aspen, Trembling: 'Prairie Skyrise' (left) with reference varieties 'Erecta' (centre) and Populus tremuloides (right)

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