This seems to be an easy plant for most...just not for me. Does anyone know what I'm doing wrong? I would like to keep part of it in a container and put part in the garden. (the green plant on the right is Soleirolia soleirolii, grown under the same conditions.)
It is currently in the plastic that it came in, in a NW window receiving only morning light. I'm watering when it's completely dry.
I know you said you only water it when it's completely dry, but your soil looks really wet right now. Maybe it's just the lighting or maybe you just watered it, but it makes me wonder how you're judging completely dry--are you just looking at the surface of the soil, or are you checking down farther in the soil where the roots are? The surface of the soil can dry out very quickly while it's still sopping wet underneath and overwatering could cause the problems you're seeing. Too little water can cause similar symptoms, so if you really are letting it get completely dry for too long that could cause problems too.