High Heat Flowers For Hot Summer Areas, Gazania (Gazania rigens) This bright trailing annual comes in a host of colors. Gazanias are tender perennials grown as an annual in harsher climates. The flowers close at night.
My grandmother's favorite--Lantana is so easy to grow. It attracts butterflies, loves sun and can tolerate drought. Good watering results in a showy and large plant. Freezes to the ground in winter but returns year after year.