The creations were designed for the Elton John AIDS Foundation White Tie and Tiara Ball last month.
To create a dramatic entrance, hundreds of Dahlia and Digitalis 'Dalmatian White' were planted together with an eclectic mix of objects used for mulches, including plates, bottles and cutlery. There was also a "mysterious" tunnel made of birch and ivy.
The ball is an exclusive and expensive event. Designer Ian Drummond said: "It's been great fun. This year we decided to base our designs on the outrageous outfits worn by pop singer Lady Gaga."
Other clients of the firm include the British Library, the BBC, Harrods, Selfridges and Warner Bros.