The number of cuttings to make a "full" plant depends on how much room there is in the pot, and also depends on your personal preference. Obviously, the more cuttings you propagate into the pot, the fuller the plant will be.

Gabi

Is there a way to encourage it to fill out without the additional cuttings?

Sorry, but I don't think so (tho' I'm not positive).

Tho' I no longer grow this particular Hoya, as I recall, its nature was to lengthen & not really branch. Also, pls. know you'd fare best to plant it small, w/ little spare room in its pot.

I have a huge hoya compacta in 8" pot. I think maybe 20 hoya plants in it, is blooming now.
Jan

Oh, I'm sorry I guess I misunderstood your question. I thought you had already cut the top half off (or decided to do so), and that you wanted to know how many cuttings you'd need for a full pot.

I agree with PG...in my experience with this plant, it doensn't branch out. I'm not 100% on this, but I haven't seen it happen. Best thing to do is take cuttings.

Gabi

Hi, I agree, mine has never branched out until this year, which is when the end died off (not sure why). Now I have a new branch growing. I'm now tempted to chop some of mine off, have a go at rooting it, so that I could get a fuller plant. Maybe next spring when it gets warm again.