These miniature flowers (actual size) are made out of metal alloy which has been modelled and hand painted. The pots are made of bronze and cold painted. They were done in the 1920s and are the work of Beatrice Hindley.
Beatrice was asked by the illustrious garden designer, Gertrude Jekyll, to make the plants for Queen Mary's dolls' house. These little pieces are highly collectible with individual pots selling for considerable sums of money. She also made flowers to go in Titania's Palace, a miniature castle that was hand-built in Ireland for Sir Neville Wilkinson. You may have seen it when visiting Legoland, Denmark.
When Beatrice died she left her entire collection of miniature flowers to the Queen.
video of Titania's Palace in Legoland, Denmark - if you look carefully you can see Beatrice's flowers.