cultivated Christmas trees
...that the Canadian province of Ontario has had quality grades for cultivated Christmas trees mandated by law since 1965?
...that the <a class="mw-redirect" href="./Canadian_province" id="mwDA8" rel="mw:WikiLink" title="Canadian province">Canadian province</a> of <a href="./Ontario" id="mwDBA" rel="mw:WikiLink" title="Ontario">Ontario</a> has had quality grades for <b id="mwDBE"><a href="./Christmas_tree_cultivation" id="mwDBI" rel="mw:WikiLink" title="Christmas tree cultivation">cultivated Christmas trees</a></b> <i id="mwDBM">(tree farm pictured)</i> mandated by law since 1965?