Too often trees are planted too close to the home and/or grow to overtake the roof line.  Trees overhanging roof can cause damage to the roof shingles as well as issues in drainage.  Rubbing can cause excessive granule loss leading to shingle failure.  Debris such as branches, leaves, sap and seeds can end up in the Eavestrough and eventually clog the Downspouts.  Make sure to prune your trees back away from your Home to prevent damage and prolong the life of your roof.