Can I add aluminum sulfate to my soil to make my Blue Girl roses more blue than pink?
Anonymous added on June 13, 2011 | Answered
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Answered on June 13, 2011
You can certainly give it a try but I have not heard that it works with roses. Here is an article for you on Blue & Black roses: https://www.gardeningknowhow.com/ornamental/flowers/roses/black-roses-blue-roses.htm
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