While many people think of coniferous plants, like pine and fir trees, when they think of evergreens, there are also several types of evergreen plant that fall outside of the coniferous classification. Evergreens are plants that retain green foliage, like leaves or needles, all year long. Some of these evergreen plants -- instead of bearing characteristic pine cones -- produce purple flowers.
The violet trumpet vine (Clytostoma callistegioides) is a robust, woody climbing plant that is native to the southern regions of Argentina and Brazil. As the University of Florida notes, the evergreen vine produces glossy, bright green leaves and 3-inch tubular or trumpet-like flowers. These flowers range in color from lavender or pale bluish-purple to purple. The violent trumpet vine also produces prickly seed pods, which release winged seeds for the wind to carry off and disperse for germination. In the garden, violet trumpet vines can tolerate partial shade to full sun, but they have a low tolerance for salt. The vines grow quickly along pergolas and fences, and attract hummingbirds and butterflies.
As the University of Florida notes, the evergreen giant lilyturf (Lirope muscari) is a grasslike plant that grows in clumps. While the tall, narrow leaves -- or blades -- of the plant remain green year round, its spikes of flowers bloom only in summer. These flowers range in color from lilac to purple. In the garden, evergreen giant lilyturf plants can provide an alternative and more colorful source of ground cover compared to standard turf. The University of Florida describes the plants as giving landscapes a “fine-textured,” “gentle” and “soothing” appearance. You can also use evergreen giant lilyturf plants to edge walkways and other outdoor areas, like patios. While the plants are tolerant of cold temperatures, they require well-drained soil and can be susceptible to weeds. A single evergreen giant lilyturf can grow to be 2 feet in width.
The purple allamanda (Allamanda blanchetii) is a vining, evergreen shrub that produces whorls of climbing stems. Growing from these stems are small, light green leaves as well as tubular or funnel-shaped flowers. According to the University of Florida, these flowers typically have two tones: a reddish-purple and a lighter, pinkish color. In the garden, purple allamanda plants attract hummingbirds and butterflies. While you can train the plants to grow on -- and cover -- arbors, trellises and other supports, you can also use purple allamandas as free-standing shrubs. While pinching off sections of a purple allamanda’s sprawling stems can help you tame the plants, too much pinching can inhibit the growth of new flowers.