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Zinnias are popular garden flowers because they come in a wide range of flower colors and shapes, and they can withstand hot summer temperatures, and are easy to grow from seeds. They are grown in fertile, humus-rich, and well-drained soil, in an area with full sun. Zinnias are annuals, shrubs, and sub-shrubs. These flowers are notable for their solitary long-stemmed flowers that come in a variety of bright colors. Most species have upright stems but some have a lax habit with spreading stems that mound over the surface of the ground. They typically range in height from 10 to 100 cm tall (4" to 40"). The leaves are opposite and usually stalkless (sessile), with a shape ranging from linear to ovate, and a color ranging from pale to medium green. The flowers have a range of appearances, from a single row of petals to a dome shape. Zinnias may be white, chartreuse, yellow, orange, red, purple, or lilac.