Tall flowers command attention whether they are blooming along a garden fence, as the background of a flower garden or as a clump in the center of your landscape. Plant tall flowers based on your hardiness zone, soil type and available sunlight for showy bloomers from spring to fall.
The Canna X generalis, commonly called cannas or canna lilies, may grow up to 8 feet tall with colorful flowers in shades of pink, red, orange, yellow and cream. A relative of the banana plant, cannas grow from multiple-eyed rhizomes and bloom during the summer and into the fall, depending on your location. Each canna flower has three petals, three sepals and three stamens. Hardy in zones 8 through 12, cannas prefer full sun and moist soil. Plant cannas in groups during the mid-spring. If you live in a colder climate, remove the rhizomes from the ground and protect them over the winter.
Allium giganteum, also known as an ornamental onion, grows up to 5 feet tall with a globular, softball-sized cluster of tiny purple florets in the spring. Hardy in zones 5 through 8, the giant onion grows from a bulb that you can plant in the fall. Allium grows best in full sun and soil that drains well. The bulbs are subject to rot if left in standing water. The tall, showy flowers make good cut or dried flower arrangements. The leaves have an onion fragrance when bruised. The tall stems are susceptible to high wind damage; plant allium in wind-protected areas of your garden.
The Japanese anemone is a perennial plant which can grow up to 5 feet tall with striking flowers in shades of pink and white. Also called windflower, anemones are hardy in zones 4 to 8. Plant them in full sun or partial shade in well draining soil. Once established, Japanese anemone can spread aggressively in your garden through underground rhizomes. The showy flowers can bloom from August to October, depending on your climate.
Hollyhocks are biennial plants that often produce leaves one year and flowers the next, but some hollyhock plants last longer than two years and may be classified as short lived perennials. Hollyhocks can grow in excess of 9 feet tall with a succession of flowers that bloom along the tall stems. Blossoms range from a deep maroon and other shades of red, to yellows pinks and whites. Flowers bloom from late June to August. Hardiness zones for growing hollyhocks range from 4 to 8, depending on the variety and care management.