Columbine is another wonderful perennial for the weekend gardener. The flowers are very pretty, and come in shades of white, pink, purple, yellow and two-toned. They generally arrive in late spring, and bloom until the middle of the summer. Depending on the variety, they may range in height from 12 inches to 30 inches. An added plus is that they are attractive to hummingbirds as well as humans.
Columbine can be grown from seed sown in the late spring or early summer. These will not produce flowers until the following year. Sow them in a partly shady area of your garden in soil that drains well. Cover them very lightly with soil, and once they have germinated, thin them to about 12 inches apart. If you prefer, established plants are usually available in most garden centers, and can be set into the ground after the last frost in the spring. Space them 12 inches apart, or up to 18 inches apart for the taller varieties. Columbine will self-seed if you don't remove the spent flowers. Nevertheless, it is only hardy for about 4 years so if you enjoy the plant, you might want to throw a few new seeds into the garden every spring.