So you have these potatoes sitting in water with shoots sticking out of them, what do you do now? Sorry I didn’t post this sooner for those playing along.
Carefully twist them off the potato. You should get a tiny bit of the tuber at the base of the stem. Stick the stems in a jar, bowl or cup with water in it. In two days come back and check the roots. When they are about an inch long, take them to the garden and plant them. It’s that easy. The time is in growing the shoots on the potatoes.