One additional comment - While it is true that potassium is a common ingredient in fertilizers, the back flush from a water softener has a very high concentration of salts, potassium/sodium plus calcium and magnesium chlorides. A solution with a very high concentration of any salt can damage plant life. Therefore, it is wise to not drain your back flush directly on top of plant life. Going down the driveway is also a bad idea.
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“There is no such thing as a normal period of history. Normality is a fiction of economic textbooks.”
— Joan Robinson, “Contributions to Modern Economics” (1978)
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