May I add that ash even ash from boxes will raise the pH it will also add K/potassium to your soil which it says it is low in.
Potassium is also called potash because it was discovered from ash from the burning of potted plants.
Wood ash is what you also make lye from by running water through it.
It is very caustic concentrated and is immediate.
As was said bust up the charcoal and put it in the garden too.
Be reminded the Ag extension guys recommend stuff from commercial sources.
Worth
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