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Two lilacs from one
The Chinese lilac has two subspecies — Syringa oblata ssp. oblata
(formerly ssp. giraldii) and S. oblata ssp. dilatata.
As a result, there are two distinct "looks" to Hyacinthiflora lilacs,
depending on the cultivar’s
ancestry. Most consider ssp. dilatata cultivars
as better garden plants — they are shorter and fuller, with hardier buds and flowers.
Though initially all Hyacinthifloras were double, Émile Lemoine introduced a new race
that included singles in 1911. These arose by crossing
ssp. oblata lilacs with more improved cultivars
of the common lilac. 'Turgot'
and 'Esther Staley'
are later examples of these crosses.
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A Labour of love
The hybridizing work was difficult, with the deformed double florets
of Syringa vulgaris 'Azurea Plena'
being crossed with pollen from the Chinese lilac S. oblata.
Though very few seeds resulted, the first offspring finally flowered in 1876
and was named 'Hyacinthiflora Plena'.
Along with the first hybridized Double French lilac, this plant took the
world by storm at the 1878 Paris World Exposition.
Reflecting their maternal (S. oblata) heritage, most Hyacinthifloras
have bronze-tinted leaves and bloom early, about 10 days before the common
lilac.
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