Bankside Open Spaces Trust has been awarded a special Champion of Champions certificate by London/Britain in Bloom for the second year running.
The Champion of Champions announcement was made by BOST chair Tim Wood at the third annual BOST Flower & Vegetable Show in Red Cross Garden on Friday afternoon.
Cathedral School, which is opposite Red Cross Garden, won the 'Largest SE1-grown Vegetable' prizes with a marrow and rhubarb.
Among those presenting the rosettes were Mayor of Southwark Sunil Chopra and Cathedrals ward councillors Adele Morris and Maria Linforth-Hall.
Earlier Southwark's public health, parks & leisure cabinet member Barrie Hargrove toured the stalls.
A lively Punch & Judy Show was enjoyed by children and families.