and were do I buy that product?[/quote]
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Good old fashioned Epsom Salt? Almost any place. Grocery stores, CostCo, drug stores, etc. It's used mostly for soaking painful bodies, it's very good for that. Soak your feet in hot Epsom Salt water, then dump the cooled water on your flowers. Do them both good, feet and flowers.
This is even found in plastic bottles of drinking water, in the ones called mineral water. The mineral mostly used is Magnesium Sulfate, which translates to good old Epsom Salt!~
Does well in salves for rough skin, etc. Lots of uses for this mineral.