If your yard has multiple foreign objects, then we would recommend you have a clean up. One of the most important objects that need to be cleaned off your lawn and/or mulch beds are leaves. Leaves can stop or cripple the growing process.
The best time to do a clean-up is during the spring to promote better growing conditions. Another time to do a clean-up is during the fall, to help make the clean up process easier and to promote new growth in the spring.