Have a mini Phal that I bought at discount price, and it was looking very good at the time. After repotting in a suitable small pot that I had to fashion out of something else,I noticed the roots got very brown and mushy, and it was creeping up towards the top of the plant (flowers at this point had dropped off all at once!) Being a Newbie to this (bought my first mini phal in May this year) I had no idea what to do. Quick internet search gave me an article for root/crown rot treatment with Hydrogen Peroxide and Cinnamon. I started this treatment and used it for a week to 10 days, Lo and behold the rot stopped. Having checked the plant today it appears it has one good large green root, but other than that nothing. How should I proceed? Or is it just a wait and see game?
Great – you saved your orchid!!! Since you could stop the rootrot and you still have one good root left it has a chance. I would water as needed and fertilise it with higher nitrogen fertilizer ( stimulates growth of roots and foliage) – be carefull to use a low dosage to not burn the only good root.
And most of all….patience….lol
Succes and keep us posted!