Woodland Petunia is an interesting plant in that it has showy, lavender flowers and a long time frame for blooming, but the individual flowers only last for a day and it is unclear what its primary pollinators are. One study suggests that the flowers open very early in the morning and are visited by moths.
We give this plant a 2-star rating (with 4-star being the best; learn more here
) because it can be a little too tall. Its foliage stays green throughout the season, but if there aren't any blossoms, one could reasonably label the plant as "weedy-looking". Nevertheless, it is a nice plant.
Uses: Introduce the concept of Cleistogamy, which is more often associated with violets. There is a form of R. strepens that produces drab cleistogamous flowers.
Bloom time: May to September
Height: 1 to 3 feet
Space: 12 to 20 inches
Sun: Medium shade
Moisture: Average to moist