Photo courtesy of oksana l.
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Silver(y) - lilac. Flowers silvery lilac-lavender. Moderate, fruity fragrance. 35 to 40 petals. Average diameter 5.5". Very large, full (26-40 petals), borne mostly solitary, high-centered bloom form. Blooms in flushes throughout the season.
Bushy. Large, dark green foliage.
Height of 30" to 3' (75 to 90 cm).
USDA zone 7b and warmer. Can be used for cut flower or garden. Vigorous. Disease susceptibility: susceptible to blackspot . Spring Pruning: Remove old canes and dead or diseased wood and cut back canes that cross. In warmer climates, cut back the remaining canes by about one-third. In colder areas, you'll probably find you'll have to prune a little more than that. Requires spring freeze protection (see glossary - Spring freeze protection) .
Ludwig Tashner in writing an article on Blue Roses for Roseweb http://roseweb.co.za/wiki/rosewiki/index.php?title=Blue_Roses states "Messrs Kordes crossed ‘Sterling Silver’ with ‘Magenta’ and released ‘Silver Star’, ‘Cologne Carnival’ and ‘Lavendula’"