My wisteria plant is about a year old and does not seem to be growing, but the main problem is that the leaves have white spots on them.
Certified GKH Gardening Expert
If they are chalky, it could be the type of water your are using. It may be mineral deposits building up. Watering with a distilled water will stop this. If they are fuzzy, this is mealybug and this article will help you treat it: https://www.gardeningknowhow.com/plant-problems/pests/mealybugs-white-residue-on-plants-leaves.htm
It might also be crown gall, which can stunt the growth of wisteria.