Tall growing plants create a dramatic flair to the landscape and are ideal grown as a makeshift screen along a backyard patio or lining the back of a garden bed for their height and fullness. Grown in a wide range of sizes, shapes and bloom colors, tall plants also help to create a focal point to the landscape.
Hollyhock (Alcea rosea) is an herbaceous perennial plant that grows 6 to 8 feet tall and 1 to 2 feet wide, creating an ideal tall growing plant to utilize for their architectural shape and height. The single 4- to 5-inch-wide, saucer-shaped blooms have an outward facing appearance and grow on upright, erect spikes or spires that tower above the garden. Bloom colors on hollyhock include, red, pink, yellow, purple and white and emerge in June to last into August. The green, heart-shaped, large foliage on hollyhocks are three-, five- or seven-lobed and become smaller as you reach the top of the spike. They grow best in full sun and well-drained soil with average to medium moisture and tolerate a wide range of soil conditions. Plant hollyhocks in U.S. Department of Agriculture (USDA) hardiness zones 2 to 10.
Common Rose Mallow
Common rose mallow (Hibiscus moscheutos and cvs.) is a woody-based perennial flower that grows up 6 to 10 feet tall and 1 to 3 feet wide, creating a commanding landscape presence. The funnel-shaped, 8-inch-wide flowers on common rose mallow grow in pink, white or crimson and have magenta centers or eyes. Rose mallow blooms in summer to last into fall, making for a long flowering season. The ovate, serrated foliage on common rose mallow grows 6 inches long. They grow best in full sun and well-drained, moist soil that is humus rich. Plant common rose mallow in USDA zones 5 to 10.
Butterfly bush (Buddleia davidii) is a rapidly growing deciduous shrub that grows 5 to 10 feet tall and 6 to 8 feet wide. It has a large, rounded form with arching, cascading branches that hold the bright blooms. The fragrant, 4- to 10-inch-long panicles or flowers on butterfly bushes grow in a wide range of colors, including purple, yellow, white and pink, and emerge in summer to last into fall. The gray green to blue green 4- to 10-inch-long leaves emerge in late spring, just before the flowers. Drought-tolerant, butterfly bushes thrive in a range of soil types. The flowers on butterfly bushes bloom on new growth. Butterfly bushes grow best in full sun and well-drained, moist soil. They are suitable in USDA zones 5 to 9.