Posted: 12/03/2017 at 10:13
Trellis is not really suitable as it will eventually rot and your wisteria will come tumbling down (there was a thread about this happening to someone on the forum a year or two ago.) The usual way to support wisteria growing up a house wall is to use long vine eyes with galvanised wire stretched between them. The vine eyes are screwed into holes drilled into the brickwork into which you should put rawlplugs. I would put the vine eyes no more than a metre apart with 60cm spacing probably being better. You want a gap of at least 3-5cm between the wire and the wall, hence the need to use long vine eyes.
This sort of thing (other suppliers are available!):
Personally, I would try and remove the trellis complete with wisteria and then cut/saw through and discard the trellis to try and separate the two before fixing the wires and then tying the wisteria to the new support wires. Doing that would preserve the existing growth without having to cut it back although you may need to do that to some of it.
Ah, I see Obelix sent a similar reply while I was typing.
Last edited: 12 March 2017 10:16:52