When I put the wood ash from our fireplace in my compost, I always add coffee grounds at the same time. It’s not nearly the amounts you are talking about, but I bet if you can find a good grounds source (like the local coffee shop) you can get a free acidic way to balance your alkaline ash.
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.