Planning a garden, or rehabbing the one you have, is a creative and exciting project--just keep several things in mind. First, the site you choose for a flower garden should get at least six hours of sun per day. When choosing plants, try to do so on the basis of their height, soil moisture preference, flowering season and color. When planting, put taller flowers in the back of the garden, with the medium and smaller ones in front. For the background, choose one of many flowers that will grow quite tall, in a variety of colors.
Agastache, a member of the mint family, blooms on stalks that can reach two to three feet in height, making them the perfect backdrop for other bedding flowers. The flowers are tubular and, depending upon the variety, can smell like licorice (A. foeniculum), fruit ('Tutti Frutti') and mint (A. rugosa).
The colors of the blooms vary as well. If you want to attract butterflies into the garden, consider one of the blue-flowering agastache, such as A. foeniculum. For hummingbird gardens, Agastache cana will have them flying in from afar. This plant is USDA hardy to zones 4a to 10b.
Baptisia, growing 36 to 42 inches in height, offers several color choices. Baptisia alba is pure white, whereas Baptisia australis is an indigo blue, and Baptisia tinctoria is a soft yellow. Baptisia is a heat and drought-tolerant plant that will work very hard for you in your sunny garden. It will make a lovely specimen plant as well as a backdrop and the flowers are long-lasting when used in cut flower arrangements. Baptisia is hardy to USDA zones 3a to 10b, depending upon species.
Nicknamed the obedient plant, physostegia is a perennial plant with narrow leaves and tall flower stalks that bloom in a pale, rose color, although there are several cultivars, such as 'Alba' and ''Summer Snow' that bloom in white. This plant will reach 36 inches in height when in bloom, in late summer. This native of eastern North America thrives in full sun and a slightly acidic sandy loam soil. It is hardy to USDA zones 3a to 10b.