Help with Cleisocentron gokusingii

[Bunch_Of_Roots]

I have quite a few seedlings growing right now. They are outside in coastal Southern California, and they seem to like it. I was experimenting growing them in different media. I have my really young seedlings, and a near flowering size one growing in sphagnum. And other near flowering size ones growing in netpot with large bark and sphagnum. I notice the ones growing ins sphagnum have less roots compared those in bark and sphagnum. I let them dry out between watering. I think I will repot my young seedlings into bark and sphagnum mix when they get older.