The Concours international de roses nouvelles de Bagatelle (international competition for new roses) is held in June of each year in the rose trial grounds

Rose trial grounds

Rose trial grounds or rose test gardens are agricultural areas where garden roses are grown to be assessed for qualities such as health, floriferousness, novelty, and scent....

 of the Château de Bagatelle

Château de Bagatelle

The Château de Bagatelle is a small neoclassical château with a French landscape garden in the Bois de Boulogne in the XVIe arrondissement of Paris...

 in Paris

Paris

Paris is the capital and largest city in France, situated on the river Seine, in northern France, at the heart of the Île-de-France region...

's 16th arrondissement.

Established in 1907 by Jean-Claude Nicolas Forestier

Jean-Claude Nicolas Forestier

Jean-Claude Nicolas Forestier was a French landscape architect, trained with Alphand and became conservateur of the promenades of Paris. He developed an arboretum at Vincennes and the gardens of the Champ-de-Mars below the Eifel Tower...

, the city's Commissioner of Gardens, it was the first international competition to assess new roses and remains one of the most prestigious events in the commercial rose growers' calendar.

The first competition involved 148 new varieties presented by 27 French rose breeders and 31 growers from around the world.