Horticultural Archive Recovery: The Rebirth of the ‘Citrus-Rosa’
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Following a meticulous restoration of the 1894 “Glasshouse Ledgers” from a private estate in the Cotswolds, botanists have successfully recreated the Citrus-Rosa—a botanical marvel previously thought lost to the Great Frost of 1947. A rare freak plant sourced from Tibet by Victorian plant hunter Sir Cyrus Rosenbaum.
The Science of the “Scent-Swap”
Originally developed from the original Tibetan plants by the Victorian hybridist Sir Alistair Fule, the Rosa Limon-Fragrans was the result of a complex “lateral cambium graft.” By fusing the rootstock of a hardy Rosa rugosa with the scion of a Citrus limon, Fule created a plant with a dual-vascular system.
As the plant matures in early April, the floral esters of the rose migrate into the developing fruit. The result is a stunning floribunda bush that produces deep crimson blooms with a distinct “Zesty Meringue” aroma. By late summer, these blooms do not fade into hips, but swell into fully edible, rose-tinted lemons.
Cultivation Requirements.
Soil PH: Must be strictly neutral (7.0). Any acidity in the soil will cause the lemons to turn back into standard rosehips.
Pruning: Requires “Reverse-Shearing.” To maintain the citrus yield, gardeners must prune the North-facing branches while singing in a high register to stimulate the sap flow (a technique known as Vocalised Irrigation).
Hardiness: Surprisingly frost-resistant, though it is said to “shiver” visibly if temperatures drop below 2°C.
Research Source
Citrus Rosa Fragrans Genotype at Oxford University Botanic Gardens. Stultus, Iocus et al
