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Recent studies have shown that <i>M. elongata</i> (<i>M. elongata</i>) isolated from <i>Populus</i> field sites has a dual endophyte–saprotroph lifestyle and is able to promote the growth of <i>Populus</i>. However, little is known about the host fidelity of <i>M. elongata</i> and whether <i>M. elongata</i> strains differ from one another in their ability to promote plant growth. Here, we compared the impacts of three <i>Populus</i>-associated <i>M. elongata</i> isolates (PMI 77, PMI 93, and PMI 624) on the growth of seven different crop species by measuring plant height, plant dry biomass, and leaf area. <i>M. elongata</i> isolates PMI 624 and PMI 93 increased the plant height, leaf area, and plant dry weight of <i>Citrullus lanatus</i>, <i>Zea mays</i>, <i>Solanum lycopersicum</i>, and <i>Cucurbita</i> to a much greater degree than PMI 77 (33.9% to 14.1%). No significant impacts were observed for any isolate on the growth of <i>Abelmoschus esculentus</i> or <i>Glycine max</i>. On the contrary, <i>Glycine max</i> significantly decreased in height by 30.6% after the inoculation of <i>M. elongata</i> PMI 77. In conclusion, this study demonstrates that <i>M. elongata</i> generally promoted metrics of the plant performance among a diverse set of importantly non-leguminous crop species. Future research on understanding the molecular mechanisms that underlie strain and host variability is warranted.