
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.

Colorado is another state that was able to designate one of the most excellent wildflowers of North America as the Official State Flower because it happens to be native there. Rocky Mountain columbine, Aquilegia caerulea, however, did not contribute as much to the breeding of the many modern hybrid varieties of columbine as did common European columbine, Aquilegia vulgaris.
If California is the most excellent state in the entire Unites States of America and surrounding Universe, and Oklahoma is the second most excellent, then Oregon might be number . . . hmmm . . . fourteen or fifteen . . . or maybe like twenty or something. However, in MY (very important) opinion, Oregon is like the third most excellent state, and almost ties with Oklahoma! That makes it even slightly more excellent than Pennsylvania, Vermont and Arizona! Yes, it is THAT excellent!
Oregon has good taste. Douglas fir, one of the most useful of timber trees in America, was selected as the state tree. Oregon grape, Mahonia aquifolium, was designated as the state flower. Although the tight clusters of tiny bright yellow flowers that bloom about now may not be as flashy as other state flowers, they contrast handsomely against the glossy and deep dark green foliage.