Denomination: 'Balcorsunay'
Trade name: Sunny Day
Botanical Name: Coreopsis grandiflora
Applicant/Holder: Ball Horticultural Company
622 Town Road
West Chicago, Illinois
United States of America
Breeder: Ball Horticultural Company, West Chicago, 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: 2005-02-10
Application Number: 05-4544
Grant of Rights Date: 2007-09-25
Certificate Number: 2918
Date rights surrendered: 2012-09-27

Variety Description

Variety used for comparison: 'Walcoreop' (Flying Saucers)

Summary: 'Balcorsunay' has taller plants and longer peduncles than 'Walcoreop'. 'Balcorsunay' has simple type leaves while'Walcoreop' has simple and compound leaves. The lower side of the ray floret of 'Balcorsunay' is darker yellow than that of 'Walcoreop'.


PLANT: upright bushy growth habit, moderate degree of branching

STEM: light to medium green, absent to very weak anthocyanin colouration, very sparse pubescence, thick, striate (lightly furrowed) surface

LEAF: opposite arrangement along the stem, simple type
LEAF BLADE: linear to oblanceolate, acute apex, cuneate base, entire margin, no variegation, medium green on upper and lower sides, sparse pubescence on upper and lower side margins, weak glaucosity
PETIOLE: absent

PEDUNCLE: absent to very weak anthocyanin colouration, absent to very sparse pubescence
INFLORESCENCE: solitary type
FLOWER: daisy type, terminal position on flowering stem, erect attitude
RAY FLORET: average number (8.8) per flower, arrangement within the flower is overlapping, weak curvature of longitudinal axis for the majority, obovate, irregular dentate apex, absent to very weak recurvature of tip, yellow orange on the upper and lower sides, absent to very sparse pubescence on lower side
FLORET DISC: present

Origin & Breeding History: 'Balcorsunay' originated from a controlled breeding program which took place in October of 1999 in Santa Paula, California, U.S.A. The female parent was a propriety Coreopsis selection designated '62044-2' and characterized by its single flower type, gold ray florets with red base, green leaves and mounding plant growth habit. The male parent was Coreopsis variety 'Walcoreop' (Flying Saucers) and characterized by its single flower type, gold flowers, green leaves and mounding plant growth habit. Initial selection of 'Balcorsunay' took place in August of 2001.

Tests & Trials: The test and trial for 'Balcorsunay' was conducted in a polyhouse during the summer of 2006 at BioFlora Inc. in St. Thomas, Ontario. The trial included 15 plants of each variety. Rooted cuttings were transplanted into 6 inch pots on May 10, 2006. Observations and measurements were taken from 10 plants of each variety on June 26, 2006. All colour measurements were made using the 2001 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Balcorsunay' with reference variety 'Walcoreop'

Plant height (cm)

  'Balcorsunay' 'Walcoreop'
mean 53.0 41.4
std. deviation 5.93 3.53

Peduncle length (cm)

  'Balcorsunay' 'Walcoreop'
mean 30.4 25.4
std. deviation 3.30 2.49

Colour of ray floret (RHS)

  'Balcorsunay' 'Walcoreop'
lower side 13A darker than 12A

Click on image for larger view
Coreopsis: 'Balcorsunay' (left) with reference variety 'Walcoreop' (right)

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