Sawdust: Sawdust is useful to gardeners primarily as a carbon ingredient for the compost pile. It should be mixed with a nitrogen source when used directly in the soil so it won’t rob the nitrogen from plants. It does not make a good top dressing mulch because it blows and washes away. Well-rotted sawdust is compost and can be used anywhere. One of the best carbon sources for the compost pile.

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