How to Fertilize Rosa 'Firecracker'?
Balanced rose diluted feed biweekly spring until late summer blooms

Rosa 'Firecracker' · Rosa 'Firecracker'
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
Balanced rose diluted feed biweekly spring until late summer blooms