Cuttings not rooting in water

I took some cuttings of salvias, dahlia, euonymus and aster around 4 weeks ago and only the dahlia is showing any sign of rooting (they're all in water as I've had no luck in vermiculite), what am I doing wrong? I dipped them in rooting hormone and change the water every 5-7 days. Even the dahlia only has very small white knobs which I'm not even sure are the beginnings of roots! Should I wait or pot them up anyway? Thanks!
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Have a look at the "Cuttings that root in water" thread and see if you can get some ideas of timing, when to do, etc.
https://forum.gardenersworld.com/discussion/1004868/plants-that-root-in-water
I think this is the one ....
https://forum.gardenersworld.com/discussion/1004868/plants-that-root-in-water/p1
Bee x