|Botanical Name:||Salvia sylvestris|
Walters Gardens, Inc.
1992 96th Avenue
P.O. Box 137
United States of America
Jerry Van Der Kolk, Prairie Grove, United States of America
|Agent in Canada:||
Variety Rights Management
475 County Road 18
Oxford Station, Ontario
|Grant of Rights Date:||2016-09-08|
|Grant of Rights Termination Date:||2036-09-08|
Variety used for comparison: 'May Night'
Summary: The inflorescence of 'Crystal Blue' is shorter than the inflorescence of 'May Night'. The outer side of the lower lip of the corolla of 'Crystal Blue' is light blue violet whereas the outer side of the lower lip is violet blue for 'May Night'. The outer side of the upper lip of the corolla of 'Crystal Blue' is light blue violet whereas the outer side of the upper lip is blue violet for 'May Night'.
PLANT: vegetatively propagated, perennial type, upright-bushy growth habit, medium to dense degree of branching
STEM: medium green, absent or very weak intensity of anthocyanin colouration, absent to very weak glaucosity, sparse pubescence, medium diameter, square shaped
LEAF: opposite arrangement along stem, simple type, petiole present
LEAF BLADE: lanceolate, acute apex, auriculate base, crenate margin, no variegation,
LEAF BLADE (UPPER SIDE): very sparse pubescence, absent or very weak glaucosity, dark green
LEAF BLADE (LOWER SIDE): sparse pubescence, medium green
INFLORESCENCE: spike type, located in both terminal and axillary positions, erect attitude
PEDUNCLE: absent or very weak intensity of anthocyanin colouration, sparse pubescence
COROLLA: partially fused lobes, short, narrow, bilabiate shape, absent or very weak undulation of margin, absent or very sparse pubescence on inner and outer sides
COROLLA (UPPER LIP): inner side is light blue violet (RHS 92C/D), outer side is light blue violet (RHS 92C)
COROLLA (LOWER LIP): inner side is blue violet (RHS N88A), outer side is light blue violet (RHS 92C/D)
FLOWERING PERIOD: almost continuous flowering for a medium length of time beginning mid-season
Origin & Breeding History: 'Crystal Blue' was selected from a population of the Salvia nemerosa variety 'May Night' planted as part of a commercial landscaping project in Chicago, Illinois, USA in the summer of 2009. 'Crystal Blue' was selected in the summer of 2011 for its flower colour, flower density, and plant growth habit. Initial propagation of 'Crystal Blue' was done using stem cuttings.
Tests & Trials: The comparative trial for 'Crystal Blue' was conducted in a polyhouse during the spring of 2015 at Variety Rights Management in Oxford Station, Ontario. There were 18 plants each of the candidate and reference variety. Each plant was grown in a 16 cm diameter pot, one plant per pot with 45 cm spacing between the pots. Observations and measurements were taken from 10 plants or parts of plants each of the candidate and reference variety. All colour determinations were made using the 2001 Royal Horticultural Society (RHS) Colour Chart.
Comparison tables for 'Crystal Blue' with reference variety 'May Night'
Inflorescence length (cm)
|'Crystal Blue'||'May Night'|
Colour of outer side of corolla (RHS)
|'Crystal Blue'||'May Night'|
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