At the recent Bonsai School it was discussed about how Mycelium could block drainage holes at the bottom of pots and might cause water logging issues over a wet Winter. This little Pine[ not mine] was examined recently. It’s in a plastic training pot. I think you can clearing see that the Mycelium has filled every single millimetre of space 🙂

I’d be happy to find any of my pines with this amount of Mycelium in the pot!