The Q&A Archives: Fertilizer for Knockout Rose bushes

Question: Do we need to fertilize our knockout rose bushes? If so when and what type of fertilizer?

Answer: Vickie,

They can grow without supplemental fertilizer but they'll bloom best and have better vigor with a little supplemental feeding. Use a turf type fertilizer (3-1-2 ratio of nutrients) at a rate of 1 cup per 25 square feet of soil area (about 5' X 5' around each bush) every 6 weeks from spring to late summmer.

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