Because of its reputation as a bully, not everyone welcomes evening primrose into the garden. It can double or triple its size in a single season and send out long, hard to find runners to the far corners of a garden.
To keep mine tame, I've planted it inside a bottomless, plastic pot and placed rocks around the edges to prevent the stems from touching the ground and growing roots.
Not a single runner escaped between July and October. So far, so good! My only worry is that the root system will grow very deep and wide during the winter, allowing the primrose to "break out" come spring.