An important top tip which I forgot to mention in the video: Be sure to pinch out any emerging flower buds that appear at the top of the cuttings whilst they are in water (either pinch them off with your fingers or cut them) - this ensures all the energy is channelled to the formation roots!
Also, if roots are slow, reduce leaves per stem to one leaf (instead of two).
The best time to start this process is in spring.
Finally, be patient!
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