As a very sturdy plant it grows in a variety of soils providing there is enough sunlight available. That is why it can be observed along the shoulders of roadways. It also grows in forgotten places like dilapidated old country houses, and -I assume- such unfavorable associations have caused the plant to be treated without due interest. Fortunately, all attitudes can be changed. The easiest way to do so is sow some seeds collected from the wildly grown plants in the garden. Should your neighbour happen to have a clump of saponaria in their flowerbeds, or you if see it grow next to the fence, it can be divided and transplanted directly into the garden or pots. Within tree or four years it will form a nice patch growing up to 30-70 cm. Good care can invigorate the plant so much that it might become a little too expansive but do not worry, it can be easily controlled.
Soapwort is a great plant to form colourful flower compositions in the garden, especially with the bright and intense flowers of other perennials and annuals. The light pink shades of soapwort create a perfect background for them.