While a majority of plant species allocate carbon to mycorrhizal fungi symbionts as a part of their nutrient acquisition and growth strategies, the effects of mycorrhizal symbiosis on plant growth are highly variable across plant and fungal partners. Even though plants can receive many benefits from mycorrhizal symbiosis, such as growth promotion, increased nutrient uptake, increased drought tolerance, and disease and herbivore resistance, aboveground biomass response is the primary trait studied to assess the effects of mycorrhizal symbiosis. The growth benefits provided by different mycorrhizal fungi isolates also vary, but how other benefits from mycorrhizal symbiosis vary across fungi is currently unknown. Here we present data from two different experiments assessing variation in mycorrhizal response traits across plant species and across fungal isolates.  In the first study, we assessed plant functional trait responses to mycorrhizal symbiosis. We identified two tradeoff axes for plant trait responses to mycorrhizal fungi. The first axis describes roughly half of the variation in plant response and is defined primarily by allocation to aboveground plant biomass. The second axis describes allocation to roots, and this axis was not associated at all with aboveground biomass response. We also used function value trait (FVT) modeling to assess the growth of plants over time, which shows that species have different growth rate and total biomass responses to mycorrhizal symbiosis. These results indicate that while aboveground biomass production is an important plant response to mycorrhizal fungi, only using mycorrhizal growth response as a proxy for mycorrhizal responsiveness may dramatically misrepresent the functional importance of mycorrhizal symbiosis in some plant species.  In the second study, we grew Andropogon gerardii with different mycorrhizal isolates and measured plant, fungal, and soil response traits. We measured how different mycorrhizal isolates affected above-ground plant growth over time. We also identified isolate differences in plant allocation to belowground tissues, and we measured the effects of different fungal isolates on soil properties including soil carbon and the formation of water stable aggregates. These results provide evidence that these mycorrhizal isolates are functionally distinct in their effects on plants and contribute to different mycorrhizal symbiosis traits. Combined with the first experiment, we show that plant and fungal identity both greatly impact mycorrhizal response, including those that are not often measured like root and soil traits. This data suggests that in order to adequately measure plant traits associated with mycorrhizal symbiosis, we must fully consider the impacts of plant and fungal identity on the whole plant physiology.