Q: Growing Arbutus Unedo from cuttings?

Hello all:
I'm trying to grow Arbutus Unedo (Strawberry Tree) from cuttings.
My first cutting just wouldn't root. I was told that I need some "growth hormone".
I checked the local Home Depot and Lowe's, all the fertilizers, whatever their constituent chemical compounds are, claim to be good for growth!
Reading more about it I learned that "growth hormone" changes by the type of plant.
What do I need for the strawberry tree cuttings?
Thanks!
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