P.elargonium salmoneum has elegant salmon pink flowers with darker veins on the upper petals and thick yellowish green semi succulent leaves that fold upwards. It prefers well drained sandy/loam soil conditions (PH acid/neutral) in full sun and may need cutting back every alternate year to create a more spreading & leafy growth and a fertilizer containing seaweed once a week (optional) during the Autumn.
It is uncertain where P. salmoneum originates from, possibly the Eastern Cape as it was collected here by Henry G Flanagan a South African farmer and plant collector during the 1800s. This plant was also grown in the communal garden in port Elizabeth during the 20th century, but by some it is regarded as a hybrid although it has characteristics of a species pelargonium.
In 1732 a plant similar to P. salmoneum was mentioned by Johann Jacob Dillenius a German botanist possibly in the botanical papers of Hortus Elthamensis a catalogue of rare plants describing a pelargonium with yellowy green waxy leaves and and light red flowers. Robert Sweet an English botanist and horticulturist also mentioned that Johann Jacob Dillenius plant description was a hybrid of P. zonale and P. inquinans known as Pelargonium x hybridum (Kew 1789) but the Leaves and flowers differ from P. salmoneum so the mystery still remains.