Because the Garden Museum is shut for building works, this year's fair will be held in the grounds of Lambeth Palace.
The day will feature a number of stalls from specialist nurseries and horticulturists selling a wide range of fascinating and unusual plants and is the only garden fair of its kind to take place in London.
It will be the perfect opportunity for members of the public to purchase plants and ask the experts for advice.
Guided tours of the palace garden will be available for an extra charge.
Food and drink will be on sale.
Lambeth Palace
Lambeth Palace Road, SE1 7JU
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