Re: potash
You may also want to look at a product called Sul-Po-Mag (sometimes K-Mag). It is a 0-0-22 analysis and also provides magnesium in addition to potassium. (It is a mixture of Magnesium Sulfate and Potassium Sulfate.) I have to get it from an agricultural fertilizer supplier but have been very pleased with the results.
There is also an organic version of this product available from some sources.
Richard
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