For what it's worth, the soil I grow in is almost entirely made of composted hay. I get huge plants, big yields, and much better flavor than before I started doing things this way. That's why I asked about the soil test. I'm just curious how it would come back. I don't use fertilizer except in tiny amounts.
Everyone's compost is different. I have bought bagged compost that was basically poison, something about the mineral content being way off I think.
And plants will grow in rocks. Hydroponics often uses clay pebbles as a media.
Maybe someone else has had the experience of too much compost in their garden. But I think with the vast majority of gardeners, they have too little.
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