Green Annual Plants

Zinnia Green Envy

• The lime green flowers of Zinnia Green Envy are a real stand out in the garden, especially when grown with red- or orange-colored flowers. The plant's height ranges from 30 to 36 inches, making it perfect for the back of the flower border. Zinnia Green Envy also makes a great cut flower and adds an unexpected color to floral arrangements. Choose a site in full sun with well-drained soil, then water and fertilize on a regular basis to achieve optimum blooms, according to the University of Illinois Extension.

Aster Hulk

• This annual aster reaches a height of 18 to 30 inches. A wide variety of beneficial insects, including bees and butterflies, are attracted to the nectar asters produce, according to Washington State University Clark County Extension. Unlike the perennial varieties of aster that bloom mainly at the end of the season, Aster Hulk blooms all summer long. Plant in full sun, in well-drained soil that is high in organic matter, and deadhead, or remove the faded flowers, to encourage the plant to keep blooming. Pinching the plants foliage back early in the growing season will encourage this plant to bush, which will result in shorter plants that produce more blooms.

Nicotiana

• There are numerous varieties of nicotiana with green flowers. The plants range in height from 12 inches to 5 feet, depending on the variety. Nicotiana flowers are highly fragrant, mainly at night, and are a great choice for evening, or moon, gardens. Even though nicotiana is an annual plant, it will drop seeds that may come up the following spring in your garden. Nicotiana langsdorffii is an unscented variety that is best known for the 2-inch-long, bell-shaped, apple green flowers, according to the University of Nebraska-Lincoln.