While some flowers can go a long time without moisture, many simply cannot handle the heat from a long, hot summer. Luckily for warm weather gardeners, there are plenty of flowers that won't wilt as soon as the sun comes out: There are a number of hardy flower species that thrive in hot, sunny gardens.
Versatile and hardy, oxeye sunflower (Heliopsis helianthoides), also called hardy zinnia or false sunflower, is a flowering perennial that can handle long, hot summers as well as cold winters. The plant has somewhat coarse, gray-green foliage and bright yellow flowers that resemble daisies. Oxeye sunflower grows best in full sunlight, though it will tolerate some shade. The plant should be watered regularly in warmer months and planted in soil that is well drained and moderately rich.
Originally native to Mexico, Mexican zinnia (Zinnia haageana) is a heat-loving, extremely drought-tolerant annual that can handle even the most brutal Southern summers. The bushy plant boasts long, thin, gray-green leaves and daisy-like flowers that can be orange, white, red or striped depending on the cultivar. Excellent for a summer burst of color, Mexican zinnias require little care and infrequent watering. The plant should be grown in well-drained soil in a sunny location.
A native of all four of the deserts of the American Southwest, as well as Northern Mexico, Apache plume (Fallugia paradoxa) is a distinct-looking shrub notable for its feathery pinkish-red plumes and its white flowers, which bloom from April until June. A member of the rose family, Apache plume can be found in the wild along sandy washes and desert roadsides. The plant can be cultivated in dry, well-drained soil in full sun locations. Apache plume can reach heights of up to 6 feet.