Transplanting gives direct access to the root ball and planting hole, making it a useful moment to introduce granules. Early placement lets developing roots encounter the inoculum. Established plants can also be treated in the active root zone. Keep the focus on root contact rather than a weekly calendar.
Keep the context.
Biological compatibility, successful colonisation and a measurable plant response are different questions. The growing conditions matter, and general research is not a promise of a particular result with MegaMyco.
References
Read the biology at its source. These references describe general science and study-specific findings.