I placed the stems in a vase on a windowsill with low light so I can keep my eye on it and keep the paper towels moist. Some people cover the entire stem in plastic and put it in a dark place for several weeks.
I also inserted a treated stem into a pencil-sized hole in my garden that I covered with an upside down vase.
Have you rooted anything intentionally or accidentally? (Potatoes in a sack root in the dark whether you want them to or not.) It takes patience to see what, if anything, develops from an effort to root many of the finer things in life. Meanwhile, thanks to the landscaper for letting me try it with these lovely flowers.
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Copyright by Penelope Puddlisms
Postscript June 30, 2014
I peeked at the cuttings wrapped in paper towels and found not a single hair or tendril starting. My stems in the vase will likely not root but I do not regret the anticipation and hope the one I planted in my garden is more successful.