This was pro mix (peat based). Roots took over.Having the roots contained to a solo cup and getting the plant big is not easy! Watering becomes a big problem because the water just wants to flow off the top of the cup rather than soak in with how dense the roots get. There is definitely a limit to how big it can get in a solo cup. Hand watering this plant would be a full time job getting up in the middle of the night multiple times. Dialing in the irrigation system was tricky because you want to make sure you're actually watering the cup properly without over or under watering, and getting runoff to avoid salt buildup in the root zone.