Water Silene firma thoroughly when the top 2-3 cm of soil feels dry. Allow excess water to drain away. Overwatering can lead to root rot.

Reduce watering frequency in winter when the plant is dormant, ensuring the soil remains slightly moist but not waterlogged.

Prune Silene firma after flowering to encourage a bushier habit and potentially a second bloom. Remove spent flower stalks and any dead or damaged foliage.

Lightly trim back the plant in late winter or early spring to shape it and remove any winter dieback.

Silene firma can be propagated from seeds sown in spring, either directly outdoors or in a greenhouse. It can also be propagated by stem cuttings taken in late spring or early summer.

Ensure cuttings are planted in well-draining soil and kept moist.

Repot Silene firma every 2-3 years or when it becomes root-bound, preferably in spring before new growth begins. Choose a pot that is slightly larger than the current one, with good drainage holes.

Use a well-draining potting mix to prevent waterlogging.