How to Fertilize rose [Robusta]?
Rose bloom fertilizer every two to four weeks spring through late summer
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rose [Robusta] · Rosa Robusta ('Korgosa')
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 bloom fertilizer every two to four weeks spring through late summer