Robinia x margaretta 'GEORGIA DA TORINO' locust


Robinia
Flowering trees are always a highlight in any garden. In the case of this locust, this is doubly true due to the colour and size of its flowers. It is a hybrid of Robinia pseudoacacia and Robinia hispida var. kelsey. From one parent, it inherited the length of its raceme-like flower clusters, and from the other, their striking colour.
Curious about its origins? Buckle up, 'cause this is one wild botanic rollercoaster! The British experts from Kew Gardens believe it to be a spontaneous hybrid discovered as early as 1914 in Durand-Eastman Park in Rochester, New York, USA. It was found by B. H. Slavin, who named the tree Robinia x slavinii. Another record dates back to 1933, when British growers from Hillier Nurseries achieved the same hybrid through planned crossbreeding and named it ‘Hillieri’. Just a year later, the American Princeton Nurseries in New Jersey introduced the same tree under the name Robinia x ambigua Pink Cascade in 1934. And finally – for reasons beyond anyone’s comprehension – it appeared much later in Europe under the French name Casque Rouge. Who would have thought that a single tree could have such an identity crisis? 😄
Georgia da Torino is considered an improved version of the highly successful Casque Rouge locust cultivar. It was bred by Professor Maurizio Ceruti from Italy, who named it after his wife Giorgia and introduced it in 2016. This is a stunning tree with an airy canopy packed with attractive foliage and a spectacular display of deep pink flowers from late May to June. The flowers are arranged in 15–25 cm long racemes composed of pea-like (butterfly-shaped) blossoms, with a dark golden-brown flame adorning their throats. The tree produces an abundance of flowers and occasionally reblooms in summer but the flowering is rather scarce. You can encourage a second bloom though by pruning the tree after its first flowering in June.
The deciduous leaves are pinnate, medium green, typical of black locusts. Since new branches and leaves continue to grow until autumn, the tree maintains fresh green foliage until leaf drop. The canopy becomes almost spherical with age. It is quite regular in shape and provides so-called filtered sunlight, allowing for the cultivation of many other plants beneath it that do not require full sun. The ultimate height in maturity is estimated between 8 and 10 meters. The branches are far less thorny than those of the original black locust and not as brittle as those of Casque Rouge, making the tree strong and wind resistant.
Black locust prefers well-drained, poor soils and once established, tolerates long periods of drought. On the other hand, in wet and heavy soil, it has minimal chances of survival. Staking the trunk to a strong support is crucial for at least three years after planting, but we recommend keeping it secured for at least five years to ensure strong trunk development. Annual pruning in early spring before the buds begin to swell helps strengthen and densify the crown, though it is not necessary. Fully hardy to at least -34 °C (USDA 4).
Last update 28-05-2025
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