Areas that get all-day sun need flowers meant for full sun. Full-sun flowers are hardy and can live in the hottest part of the day. Planting a flower in a full-sun area that isn't meant for these conditions can lead to wilting, yellowing or browning of leaves and stems, and the lack of flowering.
Narrow Leaf Sunflower
Helianthus angustifolius, the narrow leaf sunflower, is a perennial that attracts butterflies. It is from the aster/daisy family of plants. It can grow 6 feet tall with 3- to 6-inch leaves and yellow flowers 2 to 3 inches wide. Flowers bloom summer and fall. Plant a narrow leaf sunflower plant in full sun and a well-drained soil, moist if possible. Propagate via spring or summer root mass division or by spring seeds.
Joe Pye Weed
Eupatorium fistulosum, or Joe Pye weed, is a perennial that attracts butterflies. It is from the aster/daisy family of plants. It will get 3 to 10 feet tall with leaves 8 to 12 inches long and lance-shaped. Flower clusters are pink or purple, and approximately 18 inches wide. Leaves sometimes smell like vanilla. Plant a Joe Pye weed in full sun with plenty of water. Propagate via root clump division.
Amaranthus tricolor, the red amaranth plant, is an annual. It is from the amaranth family of plants. It will get 2 to 5 feet tall with various leaf sizes and colors. Flowers are red and droopy. Plant a red amaranth in full sun and well drained soil. Propagate via seed. Leaves can be used as salad greens and the seeds are edible as well.
Crinum x powellii, or cape lily, is an easy to grow evergreen perennial. It is from the amaryllis family of plants. Leaves are strap-like and 3 to 4 feet long, with funnel-shaped, fragrant flowers 4 inches long. Flowers appear summer through autumn and are white or pink. Plant a cape lily in fertile moist soil in full sun or partial shade. Flowers are better if in full sun. Propagate via division in the fall season, every 3 to 5 years.
Lycoris squamigera, the surprise lily, is a fragrant, easy-to-grow perennial that attracts butterflies. It is from the amaryllis family of plants. It can get 2 feet tall with fragrant lilac pink flowers that are funnel shaped, 3 inches wide. Plant a surprise lily in full sun or partial shade, with the best growth being in the full sun zones. Propagate via bulb division every 3 to 5 years.