Posted: 28/05/2013 at 20:13
You can put a turnbuckle at one end of each wire. They are used to tension the wire and are useful if you can't get it tight enough by hand (which can by tricky/dangerous if you are up a ladder!) However, if you use several vine eyes along each wire to help support the weight of the wisteria (which will be considerably increased when it is wet and windy), a turnbuckle is not strictly necessary. Personally, I'd drill holes and use rawlplugs, putting in a vine eye every metre or so. Make sure you buy long vine eyes so that there is room for the vine to grow in between the wall and the wire.
Even if you find it doesn't flower, you could grow a clematis through it to provide colour. Many varieties of clematis will grow happily on a North-facing wall: