Summer brings to the garden long, hot days and a reduction in moisture. While many flowers shrink at the thought of drought and humidity, other summer-loving flowers thrive and flourish. Grown in a wide range of colors, sizes and shapes, the best summer flowers are drought- and heat-tolerant. With an ability to grow in a wide range of soil varieties, the flower has a better chance of establishment and blooming within the garden.
Purple coneflower (Echinacea purpurea) is a perennial summer-blooming flower. Growing 3 to 6 feet tall and 1 to 3 feet wide, purple coneflower has a clumping growth habit and upright shape. Drought- and heat-tolerant, purple coneflowers withstand high summer temperatures where other flowers cannot. A bird and butterfly attractant, purple coneflower is ideal nestled along a front flowerbed or grown in a cutting garden to use for fresh-cut floral arrangements. Purple coneflower has a 6-inch-wide flower that is pink to purple with golden brown centers that resemble a beehive. The lance-shaped leaves are bright green to contrast with the bright flower heads. Long-lasting, purple coneflowers bloom from summer through fall. They require full sun only and well-drained soil to thrive. To promote a long flowering season, deadhead or remove the spent purple coneflower blooms as soon as they are visible. The USDA hardiness zones for planting are 3 to 9.
Threadleaf coreopsis (Coreopsis verticillata) is a summer-blooming perennial with pale yellow flowers. Growing 9 to 18 inches tall, threadleaf coreopsis is ideal planted as a ground cover because of its low-growing nature. The star-like blossoms of threadleaf coreopsis bloom from summer to fall, making for a long-lasting summer flower variety. Threadleaf coreopsis is drought- and heat-tolerant, creating a hardy garden flower. The green parsley-like foliage on threadleaf coreopsis is high textured and complements surrounding plants that are bright and colorful. Threadleaf coreopsis has a moderate growth rate and is tolerant of a wide range of soil varieties. Threadleaf coreopsis requires full sun to part shade. The zones for planting are 3 to 9.
Zinnia (Zinnia elegans) is a colorful annual flower with a long-blooming season and rapid growth rate, the perfect summer flower. Growing in clumps ranging from 6 to 36 inches tall, zinnia flowers bloom in a rainbow of colors including, pink, yellow, orange and red. The tall, erect stems are bright green and make ideal fresh-cut flowers. Zinnia has 2-inch flower heads that are single, semidouble or double in form. Deer- and drought-tolerant, zinnia can be grown anywhere in the garden where color is needed. Lining a garden walkway, zinnia is striking. Zinnia requires full sun and well-drained soil. The zones for planting are 3 to 10.