Euanthe sanderiana stops growing roots

[Bud]

You may use seaweed mix together with the fertilizer all year round to help with the roots= although I still don't see any problems with your sanderiana roots; the Mindanaw environment doesn't have winter rest (not that I know of) nor drought....it is a constant paradise like tropical weather with high humidity. Weekly feeding with fertilizer is good for Vandas. Witholding fertilizer is like starving them....
I have my sanderiana on very bright shaded light on the south facing window in winters= in the summers I put it outdoors on direct sun.
Do not let your sanderiana feel dry nor feel cold(under 50F)
water it every morning if outdoors ( Mindanaw has morning dew or fog that moistens the roots every morning) and sometimes there is an early evening rain weekly.
Don't envy the other Vanda roots you see in pictures....who knows others envy your sanderiana roots it is thick and robust even if it is not long