I had a massive sky vine growing on columns for a few years. We have since removed the columns but here is what I have learned. They love to have a good foliar spray. Instead of just watering the ground where it's rooted, spray the whole thing. My always perked up. Apply a flower fertilizer about every other month. Don't let the ground dry out, but don't get it waterlogged either.

Thanks! I'll try those suggestions! I feed occasionally, but thought maybe I was overfeeding, water occasionally, then thought maybe I was overwatering. The one I took a cutting from got no care at all. I'm thinking it may also be getting too much sun, as it's in full sun all day. My other one got filtered shade in the afternoon.