Silene armeria, commonly known as Sweet William Catchfly, is a herbaceous perennial plant native to open woodlands and grassy fields in Europe and North Africa. It typically grows between 20 and 70 cm tall and is characterized by its lance-shaped leaves and clusters of vibrant pink or lavender flowers that bloom in summer. The flowers are arranged somewhat openly or compactly at the end of stems and are known for their sticky stems that can trap small insects, although it is not considered a carnivorous plant. The common name "dwarf catchfly" refers to smaller cultivars of this species.

Sweet William Catchfly is appreciated for its showy flowers and ease of maintenance, making it a popular choice for borders, rock gardens, and cottage gardens. It thrives in full sun to part shade, preferring well-drained soils. While it is not a demanding plant, it can self-seed prolifically under favorable conditions, which has led to it being potentially invasive in some regions, such as the United States. Gardeners should be cautious and check local regulations before planting it outside its native range. It has been found to become invasive in North America after escaping cultivation.CC BY-SA 4.0