My experience is limited but I have air layered wisteria for the last two seasons. They are easy to layer and do well after seperation. Last year one beach caught a hose going to a second story balcony. That beach offered better sunlight up high and the beach grew 20’ during last summer. I layered the branch around late July and got a 20’ separated wisteria. They seem to take years before putting on girth though. I’m guessing ground growing then chopping is the way to go. Someday I hope to have a nice fat wisteria to layer. I’ve also thought about grafting into mature wood but have not tried grafting wisteria yet. More to learn,