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Wisteria doesn't have a crown. The roots also have no need to be exposed.
DesignZ, what you have is a cutting or of wisteria that has too much stem still on it. Cut the browning part off just below where the roots are coming out. That bottom part is rotting because it is below the roots and therefore has no nutrient uptake.
Reread all the posts and see that these are not new plants. My suggestion still applies: cut off the stem just below some roots. Remove the old section of rotting stem. Replant top of plant.
DesignZ, what you have is a cutting or of wisteria that has too much stem still on it. Cut the browning part off just below where the roots are coming out. That bottom part is rotting because it is below the roots and therefore has no nutrient uptake.
Reread all the posts and see that these are not new plants. My suggestion still applies: cut off the stem just below some roots. Remove the old section of rotting stem. Replant top of plant.
