When Americans “do flowers” the preferred look is definitely quick and casual. The most popular flowers are whatever looks most appealing,” she said, “Color is often the motivating factor. In summer, this usually translates to upbeat colors “with oomph” with emphasis on rich pastels or vivid shades of oranges, reds, pinks, and yellows, plus cool-down shades of blues, purples and white. Mixed color combinations and monochromatic arrangements are equally popular now, she said. And Americans are choosing to style their flowers in both the newer natural “loose and airy look” that’s the coming trend in Europe these days, and in the more tightly-packed, often low-slung, floral design approach that’s very popular in the U.S.