Ultraviolet

Phlox

Variety Description

Variety used for comparison: 'Nicky'

Summary: The stem of ‘Ultraviolet' has a weak intensity of anthocyanin colouration while that of ‘Nicky' has an absent or very weak intensity. The corolla lobe of ‘Ultraviolet' is medium purple while that of ‘Nicky' is medium violet.

Description:

STEM: medium thickness at middle third, weak intensity of anthocyanin colouration, medium length internode at middle third

LEAF: moderately elongated to medium length to width ratio, broadest part at middle, flat in cross-section, acuminate to acute apex, no variegation, absent or weak anthocyanin colouration development on upper side later in season, absent or weak undulation of margin

TIME OF BEGINNING OF FLOWERING: mid to late season
INFLORESCENCE: many flowers
PEDICEL: short, absent or weak intensity of anthocyanin colouration
PERIANTH: present
CALYX: short, absent or weak intensity of anthocyanin colouration
COROLLA LOBE: medium length, medium width, obovate
COROLLA LOBE (INNER SIDE): medium purple (RHS NN78A/B), no secondary colour
COROLLA EYE: medium purple (RHS N74A)
COROLLA TUBE: medium length, small diameter directly below lobes, medium violet (RHS 72B)
ANTHER: light yellow
STYLE: light green

Origin & Breeding History: 'Ultraviolet' originated from a cross between 'Nicky', as the female parent, and 'Swirly Burly', as the male parent, conducted in August of 2013, in Zeeland, Michigan, USA. The resulting seeds were collected and sown in the fall of 2013, in Zeeland, Michigan. The new variety was selected in the summer of 2015 based on flower type, plant habit, and disease resistance. 'Ultraviolet' was first asexually reproduced by shoot tip cuttings in the fall of 2015.

Tests & Trials: Trials for ‘Ultraviolet' were conducted during the summer of 2025 in Oxford Station, Ontario. Plants of each variety were grown outdoors in 22 cm pots under a galvanized steel structure covered with black mesh shade fabric. Plants were spaced approximately 45 cm apart. Observations and measurements were taken on 20 plants of each variety. Colours were determined using the 2015 Royal Horticultural Society (RHS) Colour Chart.

Comparison table for 'Ultraviolet' with reference variety 'Nicky'

Colour of corolla lobe (RHS)

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Phlox: ‘Ultraviolet' (left) with reference variety ‘Nicky' (right)

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Phlox: ‘Ultraviolet' (left) with reference variety ‘Nicky' (right)