Not enough light to power growth and flowers

What's happening

Hoya kerrii is naturally slow, but in dim light it nearly stops: it can't gather the energy to push new vines or, more frustratingly, to form its clusters of star-shaped flowers. Hoyas need consistently bright light to mature and bloom, and a spot that's merely 'okay' is often the reason a healthy plant just sits there year after year.

How to fix it

Move it to the brightest indirect light you can offer — right beside an east window, or filtered south/west light — and be patient, as blooms come only on mature plants. If your space is dim, a full-spectrum grow light is often the deciding factor. Don't cut off the old flower stalks (peduncles) after blooming, since Hoyas rebloom from those same spurs. Keep it slightly root-bound and feed lightly in the growing season to encourage flowering.

This is general guidance based on common symptoms; individual plants vary.