My wisteria is in the garden not against a wall and here in the Charente we had a late frost last week and it has damaged the wisteria which was in full bloom. What should I do ? Help please
Wait until any other damage of frost has passed. You can then cut back the damaged areas to one healthy leaf node past the damage.
You can also just leave the damaged areas, especially if this is a mature Wisteria. New growth should quickly cover the damaged areas.
If flowers were completely damaged, they should drop on their own.