Onions partnered with beneficial soil fungi (AM fungi) grew stronger, produced more flowers, and became far more attractive to pollinators. The best-performing mix of fungal strains helped onions take up more nutrients like phosphorus and potassium, grow taller stalks, and make more blooms — which in turn drew significantly more bees, butterflies, and flies. These fungal helpers also increased bulb yield and seed weight, showing how mycorrhizal fungi can make crops healthier, more productive, and better supported by the surrounding ecosystem.