I have had four monstrous vandas growing in baskets but their roots have crawled all over the wall they hung on. Their roots are over 6 feet long and they look like old men. Stalks are skinny, black and gnarled, but they bloom - mokaras.
On SUnday I decided to pull from wall and repot and clean up. I sprayed with Organicide -bactericide, fungicide and insecticide - and repotted in new baskets and rehung.
Should I cut off some of the length of the roots? I had to rewind them and tuck into baskets bz they touch the ground below. Roots are brown and green. I suppose they are healthy. Some of leaves have black spots, they were always in the sun, and the main stalks are black and covered with a brown, crispy, papery-like skin. I washed everyone in detergent and water and sprayed, then hung em out to dry.
I also had to cut off tops bz they had grown so tall some of them had offshoots, three or four each plant.
So will they live, and grow again. Such drastic measures sometimes kill my orchids, but I had to do this to these old guys.