Silene pendula prefers consistently moist soil, especially during its active growing and flowering periods. Water regularly, particularly in dry weather, ensuring the soil doesn't become waterlogged. Reduce watering slightly as the plant approaches the end of its annual cycle.

Regular deadheading is key to maximizing the bloom period of Silene pendula. Snip off spent flowers promptly to prevent the plant from diverting energy into seed production, which encourages the development of new buds. This practice not only extends the vibrant flowering display but also helps maintain a neat and compact plant habit throughout the season, preventing unwanted self-seeding.

Silene pendula is easily propagated from seed. Sow seeds directly outdoors in early spring after the last frost, or indoors 4-6 weeks before the last frost. Lightly cover the seeds, as they need light to germinate.

As an annual, Silene pendula does not require repotting. It is typically grown from seed each year. If starting indoors, transplant seedlings to their final outdoor location or larger containers once they have developed a few true leaves and the risk of frost has passed.