Lilacs (genus Syringa) are members of the olive family, Oleaceae.
Lilacs are not native to Canada: they are European or Asian wild species or cultivated varieties (cultivars), derived from them. Isabella Preston's lilacs were cultivars derived from two Asian Syringa species.
One of the most widespread species in Canada is the common purple lilac (Syringa vulgaris), which is native to southeastern Europe—specifically the Balkans—but was introduced to Canada by settlers.
Preston lilacs were selected to flower two weeks later than other cultivated lilacs. This avoids late frosts, and makes them hardy for the Canadian climate!
Hailed as the "Queen of Ornamental Horticulture", Isabella Preston was the first to focus on breeding ornamental plants at the CentralExperimental Farm, where she helped develop much of the Farm's collection of lilac species.
Many of the 71 cultivated varieties (cultivars) of Preston lilacs were named for Shakespeare heroines. Preston also named her crab apple hybrids after Canadian lakes,irises after Canadian rivers, and lilies after office workers and Allied aircraft of the Second World War.
Featured on the reverse, the 'Isabella' (Villosae Group) cultivar received the Royal Horticultural Society's Award of Merit in 1941.
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