Colorado must really like blue. Not only is the state tree the Colorado blue spruce, but the state flower is the Colorado blue columbine, Aquilegia caerulea. However, the flowers are not always blue, and in fact, are often white or various shades of pink or soft yellow, or a combination of two colors. The many other specie and hybrids of columbine add even more shades and combinations of richer shades of blue, red, yellow, orange and purple. The distinctively lacy foliage is somewhat bluish. A few varieties have chartreuse foliage.
Although potentially perennial, most columbine do not reliable regenerate after winter dormancy, so are instead grown as spring and summer annuals. Flowers are not as abundant as those of other annuals, but are interesting close up, and very attractive to hummingbirds. Mature plants stand about a foot tall, so work nicely in pots surrounded by lower and more colorful annuals like lobelia and alyssum. Columbine prefers partial shade and rich soil. Plants in full sun tend to be more compact and seem to be a bit faded. Incidentally, some parts of the plants are toxic.