Biostimulants are a large part of agricultural inputs and there is a growing number of commercial microbial inoculants. These aim to restore soil health and enhance crop yields after resource intensive crops or soil disturbance. While farmers may be compelled to apply commercial inoculants, whether they are effective is unknown, which perpetuates a sentiment of skepticism toward these products among farmers. Arbuscular mycorrhizal fungi (AMF) establish one of the most important symbiosis with plants and the number of AMF inoculants available on the market is growing. However, these inoculants typically contain a single fungal strain, which may not necessarily establish or, conversely, could displace indigenous taxa. Agricultural systems already contain indigenous AMF that may be used as a natural source of inoculum. As such, our research is determining whether on-farm augmentation of indigenous AMF is a more effective, safe, sustainable, and cost-effective alternative than using commercial inoculants.