Macy’s 42nd annual flower show, which started Sunday, celebrates America the Beautiful.

The main floor of the Herald Square flagship has been transformed into a floral paradise with vignettes for various regions throughout the country. A Southwestern grouping includes saguaro and barrel cactus, for example, while New England hosts a garden party, complete with women wearing orchid-strewn hats. Roses, poppies and anemone mingle in a blood-red centerpiece roped off in the middle of the fragrance department, and there’s also a floral interpretation of the Statue of Liberty torch.

Nearly all of the plants and flowers in the show are potted, according to a Macy’s docent, and the 18 cherry trees in the exhibit will be donated at the conclusion of the event to the Girl Scouts of Dutchess County, to be planted in parks in the region.

Horticulture lovers can take an audio tour of the show while they walk through the store by listening in to a special tour on their smartphones.

In addition to various regions of the U.S., the flower show helps to highlight Macy’s Scent Event, a national promotion sponsored by the Fragrance Foundation that will run from Wednesday to April 2 in stores and online. The companies participating include Givaudan, Mane, International Flavors & Fragrances and Firmenich.

The flower show is also being staged at other Macy’s stores around the country including Philadelphia, Chicago, Minneapolis and — the place where it all started more than four decades ago — San Francisco. The flower show will run through April 3.