How to Fertilize Farrer's threepenny-bit rose?
Rose fertilizer every two to four weeks from spring through late summer

Farrer's threepenny-bit rose · Rosa elegantula 'Persetosa'
Also known as: threepenny bit rose
Grow in fertile, humus-rich, moist but well-drained soil in full sun or part shade. 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. Suited to wild gardens and edge of woodland planting. See rose cultivation
Rose fertilizer every two to four weeks from spring through late summer