Karmijn de Sonnaville is a relatively unknown Cox-style apple, from the Netherlands. It has an excellent rich aromatic flavor, similar in many ways to Cox's Orange Pippin. If you are interested in the flavor of apples then it is definitely worth considering, and it grows well the northern states.
Like many Cox-style varieties, Karmijn de Sonnaville is a useful variety for juicing.
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Karmijn de Sonnaville seems to grow better in the continental climate of North America than it does in its native Europe.
As with Cox, disease resistance is not great, but the natural vigor of Karmijn de Sonnaville seems to help it keep going.
Advice on fruit tree pollination.
This variety was raised by Piet de Sonnaville, working at the University of Wageningen, Netherlands, 1950s. It is a cross between Cox's Orange Pippin and Jonathan (or possibly Belle de Boskoop).