Rose trial grounds

[citation needed] In the United States the All-America Rose Selections (AARS), which were first introduced in 1938,[4] were awarded annually until 2013 based on the results of testing in 21 gardens across the US over a two-year period.

In most cases, roses are identified by a number during the trial period, with their identity not revealed until after final judging.

Parc de Bagatelle in Paris hosted the first international competition in 1907.

[6][8] Over succeeding decades, trial grounds have been established in most major rose growing countries.

Some countries have several trial grounds to assess roses in a variety of climates and soils.