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to mix with the grass for better composting results. For more detailed information on composting, see Extension publication FO-3296, Compgng and Mulching. A Guide to Managing Organic Yard Wastes. If you plan to allow leaves to remain on the lawn, it must be done cautiously and should be confined to lawns with only a light covering of leaves. (Grass blades should still be visible through leaves before shredding.) Shredding is recommended; several passes using a mower with orwithout a leaf shredding attachment will improve your chances for success. Even when shredded, it does not take a very heavy layer of leaves to smother the grass, causing partial die-back, or making it more susceptible to diseases. It is often necessary to remove at least some of the fallen leaves from the lawn. Leaves from trees with leaf diseases such as apple scab, anthracnose, or leaf spot should be removed or destroyed to prevent over-wintering of the disease organisms in the debris and possible re-infection of new leaves next year. Oak leaves decompose more slowly than other types of leaves and it is best to use them for mulch or compost. In fact, their slower rate of decomposition makes them well suited for use as mulch. The decision to shred or not shred leaves for composting or mulching is a matter of personal preference and is related to the homeowner's willingness to spend money for the purchase or rental of appropriate equipment. The ability and willingness to perform physical labor and to accept the potential physical risks may also be a factor in this decision. It is best in some cases to hire a landscape maintenance company to do your shredding. You can shred leaves by running them through a shredder/chipper. This equipment is relatively expensive to purchase (several hundred dollars), and you should be sure to buy a machine that is large enough to handle your volume of leaves. Many of the smaller, less expensive machines require much more time to handle a large volume of material. Even some of the larger machines will become clogged if the leaves are wet, so it is better to only shred leaves when they are dry. Always use proper safety equipment and practices. (See Extension publication FS-3949, Home Yard Waste Chiooers/Shredderw Safety /s /moortantll Another shredding option, which may be less effective but is more readily available to homeowners, is using a lawn mower to chop leaves. Most unmodified rotary mowers will at least partially shred leaves. Use of a mulching blade may improve results. Special leaf shredding attachments are available for some major brands of mowers and cost from $20 to $60. Some are more effective than others and may include a screen that helps reduce particle size. Always follow the manufacturer's recommendations when using this equipment in order to avoid damage to your mower. Use good safety practices since debris may be thrown from the mower with considerable force and could cause serious injury. For more information on yard waste management and composting, check with your local County Extension Office. Information for Options for Disposing of Leaves was initially compiled by Jack Porter, former Education Coordinator-Yard Waste Management, University of Minnesota Extension-Hennepin County. WW-05570 Reviewed 2009 ® 2013 Regents of the University of Minnesota. All rights reserved. UNIVERSITY OF MINNESOTA EXTENSION