That's the easiest way to propagate wisteria. Early this summer (or late spring), find a side shoot that is coming off the base of the wisteria. Pull all the leaves off and scratch the stem on the bottom of the shoot just before each node. Apply rooting hormone to the scratch and use some metal staples to hold each node against the soil. Little plantlets will grow at each node. The parent plant will feed the new plants until they are rooted. Don't cut them apart until the plantlets have grown roots. It will take a couple months at least.
