Answer: These are very low maintenance plants. Knock Out roses are usually fertilized using a slow release general purpose fertilizer such as 10-10-10 and/or a top dressing of compost applied in early spring and again a few months later per the label instructions. So you should not be fertilizing at this time of year. Fertilizing late in the season will keep it in active growth late into the fall -- so that the plant does not harden off sufficiently prior to the cold weather setting in. This leads to excessive cold damage during the winter. If you are using a water soluble fertilizer, stop now. I hope this answers your question.
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