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Granite State Landscape Architects Home Events Find A Landscape Architect Licensure Sponsors Affiliates Contact Us More. Cochecho Waterfront Park Dover NH Portsmouth NH Private Residence Cochecho Waterfront Park Dover NH Mission The mission of the American Society of Landscape Architects ASLA is to lead the stewardship planning and design of our built and natural environments. Founded in 1899 the American Society of Landscape Architects ASLA is the professional association for landscape architects in the United States representing more than 15000 members. The Societys mission is to advance landscape architecture through advocacy communication education and fellowship.