Jack of Diamonds
| Denomination: | 'Jack of Diamonds' |
|---|---|
| Botanical Name: | Brunnera macrophylla |
| Applicant/Holder: |
Walters Gardens, Inc. 1992 96th Avenue P.O. Box 137 Zeeland, Michigan 49464-0137 United States of America |
| Breeder: |
Hans A. Hansen, Zeeland, United States of America |
| Agent in Canada: |
Variety Rights Management 475 County Road 18 R.R. #2 Oxford Station, Ontario K0G 1T0 Canada Tel: 613-258-9015 |
| Application Date: | 2020-07-09 |
| Provisional Protection:: | 2020-07-09 |
| Application Number: | 20-10280 |
| Grant of Rights Date: | 2024-03-28 |
| Certificate Number: | 7065 |
| Grant of Rights Termination Date: | 2044-03-28 |
Variety Description
Variety used for comparison: 'Jack Frost'
Summary: The plants of 'Jack of Diamonds' are larger than those of 'Jack Frost'. The leaf blade of 'Jack of Diamonds' is larger than that of 'Jack Frost'. The petiole of 'Jack of Diamonds' is longer than that of 'Jack Frost'. The petal on the flower of 'Jack of Diamonds' is oblanceolate in shape while that of 'Jack Frost' is rounded.
Description:
PLANT: perennial, upright-bushy and mounded growth habit, absent or very sparse branching
PETIOLE: present
LEAF: rosette arrangement, simple, reniform, acute to acuminate apex, cordate base, entire margin
LEAF BLADE (UPPER SIDE): medium density of pubescence, absent or very weak glaucosity, colour 1 is dark green to dark brown green (RHS 137A-B) along margin and veins covering a small area, colour 2 is light grey green (RHS 190D-192D) between veins covering a large area
LEAF BLADE (LOWER SIDE): medium density of pubescence, ranging between dark brown green and medium brown green (RHS 146B/C)
FLOWERING TIME: early season, short period
INFLORESCENCE: cyme type, terminal position, erect to semi-erect attitude
PETALS: open arrangement, five in number, small sized, oblanceolate shape, light blue (RHS 104D to 107D) upper side, light blue (RHS 107D) lower side
Origin & Breeding History: 'Jack of Diamonds' originated from the cross between the varieties 'Caspian Carpet' and 'Jack Frost' conducted in May 2015 at a nursery in Zeeland, Michigan, USA. The new variety was selected in September 2016 based on distinct foliage type and plant habit. The new seedling was originally asexually propagated by division in September 2016 at Walters Gardens, Inc. in Zeeland, Michigan, USA and subsequently by division and tissue culture.
Tests & Trials: The comparative trial for 'Jack of Diamonds' was conducted outdoors during the summer of 2022 at Variety Rights Management in Oxford Station, Ontario. The trial included 15 plants of each of the candidate and reference varieties. The plants were grown in 16 cm pots with 40 cm spacing between pots under a galvanized steel structure covered with black mesh shade fabric. The observations and measurements were taken from 10 plants or parts of 10 plants of each variety. All colour determinations were made using the 2015 Royal Horticultural Society (RHS) Colour Chart. Mean differences were significant at the 5% probability level based on Student's t-tests.
Comparison tables for 'Jack of Diamonds' with reference variety 'Jack Frost'
Plant height (cm)
| 'Jack of Diamonds' | 'Jack Frost' | |
|---|---|---|
| mean 2022 | 25.3 | 16.2 |
| std. deviation 2022 | 1.25 | 0.91 |
Plant width (cm)
| 'Jack of Diamonds' | 'Jack Frost' | |
|---|---|---|
| mean 2022 | 32.0 | 24.1 |
| std. deviation 2022 | 2.92 | 1.43 |
Leaf blade length (cm)
| 'Jack of Diamonds' | 'Jack Frost' | |
|---|---|---|
| mean 2022 | 11.7 | 9.2 |
| std. deviation 2022 | 1.92 | 1.13 |
Leaf blade width (cm)
| 'Jack of Diamonds' | 'Jack Frost' | |
|---|---|---|
| mean 2022 | 15.1 | 8.7 |
| std. deviation 2022 | 1.60 | 0.59 |
Petiole length (cm)
| 'Jack of Diamonds' | 'Jack Frost' | |
|---|---|---|
| mean 2022 | 16.3 | 11.6 |
| std. deviation 2022 | 1.51 | 1.37 |
Click on image for larger view
Brunnera: 'Jack of Diamonds' (left) with reference variety 'Jack Frost' (right)
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