Tree leaves with exceptionally high levels of nutrients include ash, poplar, maple, and willow. Whole leaves can be composted, but shredded leaves decompose faster. Avoid walnut leaves because they interfere with plant growth. Oak leaves are acidic and contain high tannin levels. Compost oak leaves separately and use their compost for strawberries, blueberries, azaleas, and other plants or flowers that need acidic soil.

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