Root prune
One trick is to root prune the plant. Dig a spade or garden fork into the soil 6-8″ deep and cut around a circle 12″ from the stem. Rock the spade back and forth to "shake" things up a bit. Careful not to dig up the plant.
Q: Should I root prune before planting?
A: Only if the rose you've purchased has impacted roots or they're girdling the root ball (growing in a circular pattern around the container).
The other way to reduce the amount of nitrogen a wisteria plant is getting is to root prune the plant. This is done by taking a shovel and driving it into the ground in a circle around the wisteria.
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I like to move the plant into a bigger container, because I like to grow my houseplants big, but if you are tight on space, you might want to just root prune it, and plant it back into its original container.
Here's a step by step with pictures.
If your wisteria is established but does not bloom, root prune the plant. Cut into the ground around the plant with a sharp spade. This treatment usually reinvigorates the plant and results in blooming in the next year or two.
 See also: Root, Prune, Plant, Soil, Water
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