Question: are coals from fire good for garden?
Answer: If your yard or garden soil has a pH of 7 or higher, give the ashes to a friend with a more acidic soil. Don't use it around acid-loving plants such as blueberries and azaleas, or on potatoes, which get scab disease if the pH is too high. Use only wood ashes, not ash from coal, charcoal briquettes or fake logs.