The Q&A Archives: Changing color of roses over a 4 year period

Question: About 4 seasons ago, my landscaper planted 5 knockout rose bushes. They have been growing fine in a sunny area. During the first two years the roses were mainlt dark red, but the last two seasons, even though the plants seem vigorous and healthy, the roses are getting lighterin color. They are now pale pink or mostly white. Is there any additive to bring the color back to red? Like garden sulfur?


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