Vandas growing thick white roots

[guccisimo85]

Hello!

All of my vandas started growing very thick white roots a few months ago. They turn green when I water them, but I am wondering what could be causing them to grow so thick? Should I be concerned?

They get plenty of light, humidity is high, and I water them daily. There was a period where I think I was over fertilizing so I wonder if this could be a protective mechanism to grow roots with thicker vellum? Two of them have spikes currently though, so they seem to be happy overall.

Curious what you all think!