whenever i bbq i use smoker chips and as they blacken i mash the burnt chips up with a hammer and add a layer when potting up. i have no idea if it helps or not! i would say not likely for immediate results. since i reuse my potting soil year after year, i like to believe it helps in the long term. if i look on my deck, i see a container with blackened wood chips that i should really crush but at -33C it will just have to wait.........for a very long time.
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i still think a good quality fertilizer, the right amount of light, the right amount of humidity, the right amount of soil moisture and the right amount of air movement is probably all that is really required for peppers.
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i also grind up egg shells and save coffee grounds as soil amendments but do they help immediately - not likely. long term i am sure they do.