Ludwigia octovalvis (lud-WIG-ee-uh ok-toh-VAL-vis)
This Mexican primrose is a wildflower growing along the side of the road in front of my house. It is a tiny plant with blooms about 1″ across and growing only a few inches off the ground. It is one of many varieties of primrose and is actually related to the rose.
Although the bloom is very pretty, not many people would cultivate this plant. But if you do, it should be planted in a moist soil and provided with plenty of water (near a pond would be great.) It probably will not withstand a freeze in winter but it will reseed its self to start a new plant next spring.
Here is a view of the entire plant.
For more information, visit the Wildflower.org website.