Enjoy a private Ecological Landscaping Association Eco-Tour of the beautiful 175 acre landscape of Mount Auburn Cemetery, 580 Mount Auburn Street, Cambridge on Thursday, April 15, beginning at 10 am.  Mount Auburn is one of the most historic landscapes in America and is on the leading edge of sustainable and environmentally sound land care practices.  This event features the more than 5,000 trees that are under Mount Auburn’s ecological tree care program.  $10 for ELA members, $15 for non members.  Paul Walker will lead the tour, and you may register on line at  www.eventville.com/catalog/eventregistration1.asp?eventid=1006114, or call 617-436-5838.  You may also email ela.info@comcast.net.