How to Fertilize auricula 'Susannah'?
Thin primula nutrient liquid every four weeks growing season

auricula 'Susannah' · Primula auricula 'Susannah'
Double auriculas are best grown in pots in an alpine house or cold frame, in a mix of equal parts loam-based potting compost, leaf mould, peat or peat-substitute, and grit. Alternatively, grow in moderately fertile, moist but well-drained, humus-rich soil in full sun or partial shade
Thin primula nutrient liquid every four weeks growing season