Can I mulch my garden with sawdust only? July 26, 2008 Can I use sawdust as my primary garden mulch if it is kiln dried, without changing my pH levels? 1 Why Blossoms Drop on Tomato Plants How to get rid of grasshoppers About jstutzman You Might Also Like How to Care for Euphorbia Plants February 8, 2010 Why Are My Tomato Leaves Turning Yellow? July 17, 2012 How do you grow Ipomoea “Marguerite” October 22, 2009 1 Comment Reply Karen July 26, 2008 at 10:48 am Before adding any amendment to your soil it is best to have a good idea of what the pH is for your area. Wood ash by nature is high in salt and pH (alkaline) and adding it without adding other amendments can disturb the soil balance. A better solution than applying it directly to your garden might be to add a small amount of garden fertilizer high in nitrogen to the sawdust and let it compost before applying it. Remember, if you have any walnut in your sawdust: it contains a toxin that can kill tomato and other plants. Leave a Comment Cancel Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.