Calcium Nitrate and Potassium Nitrate are BOTH very quick release. You would see results in days. Miracle Grow is mostly Urea, will burn if your not careful and takes a while for the Urea to be broken down by soil microbes to an ammonium form plants can use.
If you purchase ag grade cal-nitrate or potassium nitrate (expensive) you will get a pretty pure product. The nitrate is identical to what comes from "organic" sources, but it is a concentrated salt. There are very few impurities and it works well.
Too late for this year, but keep in mind for next.
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