The two most common reasons wisteria fail are: improper pruning and insufficient water. Pruning them requires a bit of know-how. Seeing that yours are very special, it may be worth getting a how-to guide (one that has good illustrations) and getting them on a pruning routine. Best of luck!
The two most common reasons wisteria fail are: improper pruning and insufficient water. Pruning them requires a bit of know-how. Seeing that yours are very special, it may be worth getting a how-to guide (one that has good illustrations) and getting them on a pruning routine. Best of luck!