How to Fertilize Rosa 'Summer Sunset'?
Apply a rose-specific fertilizer every 4-6 weeks during the growing season.

Rosa 'Summer Sunset' · Rosa 'Summer Sunset'
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
Apply a rose-specific fertilizer every 4-6 weeks during the growing season.