I also love leaves for tilling into my clay soil but you can overdo it. I did that one year when I collected 85 bags of leaves and tilled them into my 2 in-ground gardens. My peppers had yellow leaves that year due to lack of nitrogen and I had to feed them but by the next year the leaves were totally decomposed and now I have nice dark, fluffy soil. I do keep adding organic matter every year but not usually just leaves, it is a mixture of things including leaves.
Grinding them up with a mower really speeds the decomposition process.
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