I have just carried out an experiment with cuttings of Salvia 'Mystic
Spires' made 10, 11 and 12 days ago. The cuttings were all treated in the
same way in a heated propagator at 27C and 100% humidity inside a light box.
Of the 10 day old cuttings not a single one showed any root. Of the 11 day
cuttings 6 out of 8 showed some root. Of the 12 day old cuttings 4 out of 6
showed root, and on average it was a good bit longer than the 11 day
cuttings. Am I right in assuming that cuttings spend a long time in
preparation, and then the roots themselves are produced fairly quickly at
the end. I also put a number of cuttings in water, but after 12 days none
showed any sign of root.