Flowers that grow to be more than 3 feet high provide a welcome sense of drama to a garden, providing a backdrop to smaller, more diminutive blooms. Tall flowers are commonly used to form borders, or as stand-alone container specimens on a patio or porch. There are many lovely flowers that will reach impressive heights in the home garden.
The flame azalea (Rhododendron calendulaceum) is a flowering shrub notable for its dense, mid-green leaves and its clusters of funnel-shaped flowers, which seem to glow in the sunlight as if ablaze. The bright orange flowers of the flame azalea are attention-getting additions to a garden, making the plant ideal as a stand-alone specimen in the middle of a lawn. The plant may reach heights between 6 and 10 feet, though usually it grows to be about 8 feet tall. A native of eastern North America, the flame azalea is best cultivated in USDA zones 5, 6 and 7. The shrub requires dappled shade (or full sun in cooler climates) and an acidic, rich and well-draining soil. Water the flame azalea on a regular basis during the growing season.
A member of the aster/daisy family, joe-pye weed (Eupatorium fistulosum) is a tall flowering perennial that reaches heights of between 3 to 10 feet. Also called queen-of-the-meadow, the plant sports elegant, lance-shaped leaves and tiny clusters of pink or mauve flowers that appear in summer and autumn. A favorite of butterflies, beetles and bees, joe-pye weed is an imposing and unusual addition to a butterfly or woodland garden. A native of the eastern United States, the plant does best in full sunlight in USDA zones 3 to 9. Though fairly drought tolerant, joe-pye weed will by far look its best in a well-drained soil that's watered frequently throughout the growing season.
A member of the mallow family--which also includes the hibiscus flower--the hollyhock (Alcea rosea) is an upright short-lived perennial notable for broad, olive-green foliage and for its silky, cup-shaped flowers. The blooms of the hollyhock may be white, pink, or even bi-colored depending on the cultivar. The plant can be quite imposing, often growing between 5 or 6 feet tall and sometimes even reaching heights of 7 or 8 feet. Hollyhocks look their best when grown in USDA zones 3 to 9, ideally in all-day full sun. Hollyhocks require a well-draining soil, and a little supplemental water during the summer. Especially tall plants may need to be staked to keep them from falling over.