Raking leaves does not cause magnolia trees to drop more leaves. Many factors can trigger leaf drop, including overly cold or wet soils, drought, or the emergence of new leaves in spring on evergreen magnolias. Plus, shortening days and cold nights in fall cause deciduous magnolias to drop leaves.
About this Author
James Burghardt has written for "The Public Garden," "Docent Educator," nonprofit newsletters and for horticultural databases, becoming a full-time writer in 2008. He's gardened and worked professionally at public and private gardens in Colorado, Florida, Minnesota, New York, North Carolina and Pennsylvania. He has written articles for eHow and GardenGuides.