Arboretum Dedicated in Bell Memorial Park Recently, the City of Milton dedicated the Mark Law Arboretum in Bell Memorial Park in honor of long-time City Arborist Mark Law, who retired in 2018. Law passed away after a long battle with cancer shortly after the dedication. Creating an arboretum was a vision of Laws, and the City of Milton was excited to make this dream a reality. An arboretum is a botanical collection exclusively composed of trees designed to engage and inform its users about different species of trees, their origins, mature sizes, and often showcases trees that are not native to the area.