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Fiddle-leaf morning-glory, or Ipomoea stolonifera, softer looking than the rail road vine, with skinnier stems and white flowers. It can make the sand totally disappear under a carpet of dark green leaves and numerous flowers. The solid net built keeps the sand protected from the wind action, and will hold any additional sand dropped on top. This plant is also a perennial.
Ground Covers
 
 
The following ground covers are some of the easiest plants to establish. Since they are low growers, these plants are less susceptible to being directly hit by the salt spray in windy conditions. From their established point they grow across enormous distances. They build a net with their stems that cover the surface of the sand. By using taller plants to stop the wind driven sand and ground covers to hold it there, you will have the best combination of plants possible!
Sea Purslane, or Sesuvium portulacastrum, will spread several feet in all directions over a period of a few months. It resists burial very well, and with its stems covering the sand surface, retains the sand in place. Its stem color varies depending on the availability of nutrients, the temperature, and the water conditions. It is a very decorative plant with small purple flowers and stem colors ranging from green to orange to red. It is a definite keeper as an erosion control plant.

Other varieties of non-native Purslane exist. They have different leaf colors, spreading patterns, and flower colors.

Sea Purslane
 

Red Morning Glory
Purple Sea Purslane
Beach morning-glory, or Ipomoea pes-caprae, is also known as the railroad vine. This vine grows extremely fast. Its strong stems extend up to 75 feet. The flowers are about 3 inches wide and have a dark pinkish purple color. This vine can be sensitive to freezing conditions. Some of the stems may disappear during the winter, but this perennial plant will grow back the following spring with new stems and will spread again. Its broad leaves constitute a good cover over the sand, and the solid stems make the plant quite resistant to human traffic.