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4 LB, Aluminum Sulfate, Lowers Soil PH For Acid Loving Plants Like Azaleas, Camellias, Gardenias, Hemlock, Holly, Cedar, Blueberry, Etc. , Turns Hydrangeas Blue, Includes Easy To Follow Chart, Works In All Soil Types, Box.
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Hydrangeas are finally blue
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I have read it is hard to get unpotted Hydrangeas to bloom blue or purple, this did the trick. I would not get over zealous and try to go heavier than recommended, I have had better success when I reduce the recommended dose slightly but increase the frequency to every few weeks.
Rating: 
(3
out of 5) @ 2007-12-12
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