Hello. Last week I had to cut back my dracaena marginata tricolour as it was long and spindly and the double headed top was reaching my ceiling. I wanted to root the top to make a new plant, so I placed the cutting in a jar with about 1 inch or water. I just noticed a fuzzy white substance growing around the top part of the cutting, as indicated by red arrows. What is this and what should I do about it? I have many other houseplants so I want to deal with it quickly if it is something “contagious”? Thank you for any advice you can give me.
