Hi Gerry. I planted a Wisteria with a view to it training itself up a wall, but growth seems to be very slow. How can I encourage this, and how much growth should I expect from a healthy plant?
But lack of nutrients is not always the cause of poor growth. If the soil is too heavy or too wet for a wisteria, it will not grow well and may even die as the roots are denied air in wet ground.
Another problem can be planting too deeply … check the topmost root is not more than two centimetres below the soil surface. If it is too deeply planted, lift the plant in late autumn and re-plant, setting it a little higher.
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