Christmas tree stands
... that a plant pathologist conducted research on Christmas tree stands that showed just 6 of 22 had adequate water capacity for large Christmas trees?
... that a <a href="./Plant_pathology" id="mwBZs" rel="mw:WikiLink" title="Plant pathology">plant pathologist</a> conducted research on <b id="mwBZw"><a href="./Christmas_tree_stand" id="mwBZ0" rel="mw:WikiLink" title="Christmas tree stand">Christmas tree stands</a></b> that showed just 6 of 22 had adequate water capacity for large <a class="mw-redirect" href="./Christmas_trees" id="mwBZ4" rel="mw:WikiLink" title="Christmas trees">Christmas trees</a>?