Epsom salts
Thanks everyone, for the helpful replies. I'm sure what I have is a
cheap tester, so I won't rely on the results. I think I'll play
around with it on my houseplants.
I was hoping to use it to help me turn my hydrangeas blue, as the
blooms thus far have been beigey -pink.
The advice for using epsom salts on roses is great. Thanks
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