Sorry for the delay responding - just went through two graduations and preparations for a week of vacation at the Outer banks of NC (where I am now).
Superthrive, K-L-N or any rooting hormone solution will work. I use and sell K-L-N as it's the most cost effective brand out there (I have the STEM in small quantities, too), but if you check your local garden center or even Home Depot-type store, you can probably find something with the rooting hormones (indole butyric acid [IBA] and/or naphthalene acetic acid [NAA]).
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