To find out which flowers are the most popular per US state, Spring Hill Nurseries shared a list of 20 flowers with Americans in every state and the District of Columbia and asked them to choose the flower they plant in their gardens most often. 
Most popular flower per state (source: Spring Hill Nurseries)
They developed a list of 20 popular flower varieties, and all but 5 of those were favored highly across the country and ranking first in at least one U.S. state. Marigolds ranked first in Maryland and South Carolina. The orchid found a home in the Hawaiian landscape. The lilac was mostly grown in Wisconsin, while Pennsylvanians showed devotion to the lily. The adaptable iris took root in gardens across Tennessee, and the pansy ushered in springtime in Idaho and North Dakota.
Among the five flowers that did not rank anywhere in the U.S., there were some surprises. The gerbera daisy, one of the most popular cut flowers in the world, didn’t make the cut in American gardens. The petunia, an affordable way to add color and quick growth to garden beds, was also pushed out of the running. Gardeners across the country also forgot about the fragrant gardenia and the versatile dahlia. And most shocking among the garden outcasts, the violet—despite its title as the official state flower for Illinois, New Jersey, Rhode Island, and Wisconsin.
It’s worth noting that the flowers with no significant ranking cover a range of prices and ease of growth, so it is not possible to draw any cost- or maintenance-related conclusions about why these flowers aren’t grown more in U.S. gardens. 
Most grown flowers overall (source: Spring Hill Nurseries)
The most grown flowers overall
When it comes to America’s most grown flowers, the rose was beloved by most gardeners, ranking first in 19 U.S. states. This nationwide popularity among avid and amateur gardeners alike may be due in part to the rose’s low maintenance requirements. Despite its thorny armor, the rose is relatively easy to nurture with an abundantly charming result.
The broad-faced sunflower, tolerant of varying environments, stretched towards the sky in six states across the South, the Midwest, and the West. The daffodil, the hydrangea, and the peony brightened gardens in four states each, and lavender relaxed gardeners in three. The tulip, which saw a significant drop in international demand at the onset of the COVID-19 pandemic, ranked first in only one state—Alaska. Other flowers beloved by single states include the lilac in Wisconsin, the geranium in Wyoming, and the daylily in Oregon.
For more information:
Spring Hill Nurseries
www.springhillnursery.com