Polycarpon tetraphyllum prefers consistently moist soil, but avoid waterlogging. Water thoroughly when the top centimeter of soil feels dry. Reduce watering frequency during winter dormancy to prevent root rot.

Ensure good drainage in pots and garden beds to maintain optimal moisture levels.

Pruning is generally not necessary for Polycarpon tetraphyllum, as it maintains a low-growing habit. If desired, light trimming can be done after flowering to maintain a tidy appearance or to deadhead spent blooms.

Avoid heavy pruning as it can disrupt the plant's natural form.

Polycarpon tetraphyllum can be easily propagated from seed. Sow seeds in early spring directly into well-draining soil, either indoors or outdoors. Germination is usually straightforward.

Plants can also be propagated by division of established clumps in spring.

Repotting is infrequently needed for this plant, as it tolerates being slightly root-bound.

If growth appears stunted or the plant is consistently drying out too quickly, repot in spring into a slightly larger container with fresh, well-draining potting mix. Ensure the new pot has adequate drainage holes.