This is were Jim and I differ. I have used Physan 20 at the recommended dilution for four decades and have never seen phototoxicity of any of my orchids. When I want to remove seedlings from a flask, I use Physan to dissolve the agar and always soak either the community pot media or individual pot media with Physan before transplanting the seedlings. When repotting, dividing plants, and cutting away dead roots I will use Physan soaked orchid media. I still use cinnamon directly on the cut areas and on the cut-off root stubs. I might have the same success NOT using Physan but I surely have seen no damage to plants when using it. I would think, and this is just my common-sense, that IF ANY orchid would be damaged by Physan, it would surely be these tiny, tender seedlings.
