Seamac and I had a back and forth discussion on this....I think we both agree that 6" is minimum, at least for fast growing, smaller than that, it has to be done very carefully.
Fat, thick multi-noded stems....3-4 sets if possible are better than a lanky stretched out1-3 node cutting.
The amount of effort it takes to wait for a weak cutting to take, and then get growing and thriving...(could be months) ...on the other hand, waiting for the plant to get healthy enough to take a prime cutting can also take months....but at least you know success is pretty much guaranteed.
Any cutting, however, when given the proper conditions that salvia thrives in, can turn into a monster plant.

THATS whats so cool about growing these guys.....
