It sprouted! What now?

Greetings from zone 6a! Our dog broke this twig off a blueberry bush, and I decided to put it in some water after it was laying on the ground for a few days. I really wasn't expecting anything to happen, but it actually sprouted! I transferred it to well draining sand and water it just about daily. What do I do with it now? Should I trim the twig down to above the growth? Thanks for any advice!