Saving rotten wooden trellises
In the garden there is a wooden pergola/arbour with wisteria trained up it that is looking a bit decrepit. Two years of constant rain have made it warp and crack and in a couple of places it looks like the wood of the posts has rotted under the ground. The wisteria looks great though.
I'm not sure how much longer the pergola has but it will take a lot of careful wisteria growing with it when it goes. Is there anything I can do to prolong its life? The wisteria has twined around most of the wooden spars, so it is not very accessible to paint with anything.