Water Spergula grandis regularly, keeping the soil consistently moist but not waterlogged. Allow the top centimeter of soil to dry out slightly between waterings, especially during warmer months.

Reduce watering frequency in winter, allowing the soil to dry more between applications to prevent root rot.

Pruning is generally not required for Spergula grandis. However, you can lightly trim leggy stems to encourage bushier growth and maintain a tidier appearance.

Remove any dead or yellowing foliage as needed to improve air circulation and plant health.

Spergula grandis can be easily propagated from seeds sown directly in the garden or in pots in early spring. Germination typically occurs within 2-3 weeks.

It can also be propagated by cuttings taken in late spring or early summer, which root readily in moist soil or water.

Repotting is not a primary concern for Spergula grandis as it is often treated as an annual or a short-lived perennial.

If grown in a container, repot only if the plant becomes root-bound, typically every 1-2 years, preferably in spring before active growth begins. Use a well-draining potting mix.