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Roses are hungry plants that respond well to generous feeding:
- Sprinkle general-purpose or rose fertiliser around roses in spring at 70g per sq m (2oz per sq yd)
- Mulch with rotted organic matter, ideally rotted manure, immediately after adding fertiliser. Keep the mulch clear of the rose stems, leaving a 10cm (4in) gap between the mulch and stems.
- Feed roses in containers every fortnight from mid-spring until late summer with general-purpose liquid fertiliser until flower buds form and then with high-potassium liquid fertiliser, such as tomato feed.