How to Fertilize Rosa 'Trier'?
Rose-specific feed every four weeks from spring until early autumn

Rosa 'Trier' · Rosa 'Trier'
Grow in fertile, humus-rich, moist but well-drained soil in full sun. Mulch with well-rotted organic matter in late winter or early spring, and for best flowering apply a general rose or shrub fertiliser in early spring and again in early summer. See rose cultivation
Rose-specific feed every four weeks from spring until early autumn